A stone is thrown vertically upward from the ground with a velocity of 15 m/sec. One second later another stone is thrown vertically upward with a velocity of 30 m/sec. When and how far above the ground will the stones be at the same level?
Q: At what point above the ground will they meet?
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- b. What is the average speed of the train between the two stations? 2. A car accelerates from 12m/s to 25 m/s in 6.0 s a. What was its acceleration? b. How far did it travel in this time? 3. An obiect was thrown vertically upward 10 m/s from the top of a buildine 20 m1. A ball is thrown upward from the top of a 50 meter high building with an initial speed of 25 m/s.a. How much time does it take to reach the ground?b. What velocity does it have when it reaches the ground?A ball is thrown vertically upward with an initial velocity of 35 m/sec. How for above the ground will it rise? a. b. How many seconds will it take the ball to reach the highest point? C. What is the velocity after 3 sec. of flight? Is the ball going up or down? d. After how many seconds will its velocity be equal to -20 m/sec?
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- 2. A jet plane has a takeoff speed of vtakeoff = 73 m/s and can move along the runway at an average acceleration of 2.4 m/s2. The runway is 1.2 km. Write out the 3 Kinetic equations. a. b. Write out the values of initial position, initial velocity, and acceleration. How many seconds will it take for the plane to reach takeoff speed? с. d. How far will the plane have to travel to get to takeoff speed? will the plane be able to get to take off before it gets to the end of the runway? е.A bullet is fires vertically upward from a gun and reaches a height of 2250 m. a. Find its initial velocity b. How long does it take to reach its maximum height? c. How long is it in flight?At the end of a race a runner decelerates from a velocity of 8.70 m/s at a rate of 1.80 m/s2. A. How far in meters does she travel in the next 5.30 s? (Assume the deceleration of 1.80 m/s2is constant over the full 5.30 s.) B. What is her final velocity in m/s? C. Evaluate the result. Does it make sense? (Hint: what is the algebraic sign of the velocity, and what does it imply)