Part A If a flea can jump straight up to a height of 0.500 m, what is its initial speed as it leaves the ground v= 3.13 m/s Submit Previous Answers Correct Part B How long is it in the air? VO AEO t= 0.32 S. Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining
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- The acceleration of a bus is given by a, (t) = at, where a = 1.25 m/s³ is a constant. ▾ Part A If the bus's velocity at time ₁1.15 s is 4.90 m/s, what is its velocity at time t₂ = 2.20 s? Express your answer in meters per second. = 7.10 m/s Submit ✓ Correct Correct answer is shown. Your answer 6.78 m/s was either rounded differently or used a different number of significant figures than required for this part. Part B Previous Answers If the bus's position at time ₁ = 1.158 is 6.00 m, what is its position at time (₂2.20 s? Express your answer in meters. ΓΓΙ ΑΣΦ VO z= 7.90 A Submit Previous Answers Request Answer < Return to Assignment P * Incorrect; Try Again; 8 attempts remaining You may have omitted the initial velocity of the bus. Provide Feedback ? mA model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 79.6 m/s² for 1.82 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) will the rocket reach? +y Maximum altitude a2A certain freely falling object, released from rest, requires 1.95 s to travel the last 32.0 m before it hits the ground. (a) Find the velocity of the object when it is 32.0 m above the ground. (Indicate the direction with the sign of your answer. Let the positive direction be upward.) m/s (b) Find the total distance the object travels during the fall. m
- Part A If a flea can jump straight up to a height of 0.400 m, what is its initial speed as it leaves the ground? V = IVE] ΑΣΦΑ+ 195] Submit Previous Answers Request Answer Part B X Incorrect; Try Again; 5 attempts remaining How long is it in the air? 195] ΑΣΦ t= Sid Submit Request Answer ? S ? m/s SProblem #8A golf ball is dropped from rest from a height of 9.90 m. It hits the pavement, then bounces back up, rising just 6.30 m before falling back down again. A boy then catches the ball when it is 1.40 m above the pavement. Ignoring air resistance, calculate the total amount of time that the ball is in the air, from drop to catch. Number i Units
- Freya clears a crossbar while pole vaulting. She releases the pole before she achieves her peak height. It takes her 2 seconds to fall from her peak height to the landing pit. The landing pit is 1.5 m high. How high above the ground was Freya at the peak height of her vault?A hot-air balloon is rising upward with a constant speed of 2.39 m/s. When the balloon is 6.74 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground? Number i ! Units S15) You are standing on a cliff 50 m high and throw a rock with an initial velocity of 20 m/s straight up so that the rock eventually lands at the base of the cliff (50 m below you). How long is the rock in the air? a) What is the maximum height of the rock? b) What is the final velocity of the rock? c)
- A student fires a cannonball vertically upwards with a speed of 31.0m/s. Determine all unknowns and answer the following questions. Neglect drag and the initial height and horizontal motion of the cannonball. What was the cannonball's maximum height? unit How long did the cannonball rise? unit What was the cannonball's total flight time? unitYou are standing on a rooftop of a building, 70.0 high. You throw a stone directly upward at an initial speed of 15.0 m/s and leaves your hand 1.75 m above the rooftop. What is the highest point reached by the stone? 3 sig fig Your answer How long before the ball reached the ground? * 3 sig fig Your answer What is the ball's velocity just before it hits the ground? (careful with sign) 3 sig fig Your answer *-b+√b²-4ac 2a x = xo + vot + ½ât², v = vô + āt, v² = v² + 2ảAx, t = ² Problem 1: A ball is thrown straight up from the ground. The ball reaches a maximum height of 5 m. For simplicity, use g = 10 m/sec². a) What is the initial speed of the ball? Answer: 10 m/sec b) What is the time it takes the ball to reach the maximum height of 5 m? Answer: 1 sec c) What is the time it takes the ball to hit the ground? Answer: 2 sec d) At what times is the ball at a height of 3 m above the ground? Answer: 0.37 sec and 1.63 sec e) What is the velocity of the ball when it is at a height of 3 m above the ground? Answer: +6.3 m/sec or -6.3 m/sec.