A ball is thrown up at a speed of 4:0 m/s. Find the maximum height reached by the ball. Take g = 10 m/s".
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- Find the minimum initial speed of a projectile in order for it to reach a height of 2145 km above the surface of the earthTwo identical cars, A and B, traveling at 55 mi/h collide head-on. A third identical car, C, crashes into a brick wall going 55 mi/h. Which car has the least damage: (a) car A, (b) car B, (c) car C, or (d) all the same? Why is the answer C?If the diesel engine coasts at 6.0 km/hkm/h into a freight car that is initially at rest, find the speed of the coupled cars. Express your answer to two significant figures and include the appropriate units.
- Please show me how you got the answer, thanks :)2. For this series of 4 questions, a 1-lb ball is dropped from rest and falls a distance before striking the smooth plane at A. It bounces from the plane, and then strikes the plane again. You will be asked to solve for different things. Please pay attention: the numbers may change from problem to problem since they are randomized. 1) If the ball is dropped form rest at a height h = 5.2 ft, what is its speed right before it strikes the plane at A? Your answer must include 2 places after the decimal point. Take g = 32.2 ft/s². h A Your Answer: Answer B units(b) A frictionless incline is 5.00 m long (the distance from the top of the incline to the bottom, measured along the incline). The vertical distance from the top of the incline to the bottom is 1.66 m. A small block is released from rest at the top of the incline and slides down the incline. (i) How long does it take the block to reach the ground? 3.25 s (ii) What is the speed of the block just before it strikes the ground? 1.75 m/s
- A 2 kg mass experiences a force F=3+2x in the x direcntin. What is the final velocity at x=1 m if the initial velocity at x=0 m is 1 m/s. (answer in m/s)For physics equations, I always get confused on when little g should be negative or positive. How do you determine when it should be or not?Two balls, one with mass 2kg and one with mass 4kg, are dropped from 30m above the ground. Which ball hits the ground first? Prove your answer.