In a laboratory test, a car of mass 1200kg is driven into a concrete wall. a video recording of the test shows that the car is bought to rest in 0.36 s when it collides with the wall. The speed of the car before collision is 7.5 m / s. calculate
i) The change of momentum of the car.
ii)The average force acting on the car.

Steelhead trout migrate up stream to spawn.occasionally they need to leap up small waterfalls to continue their journey. fortunately, steelhead are remarkable jumpers, capable of leaving the water at a speed of 8.0 m/s. a. what is the maximum height a steelhead trout can jump? b.leaving the water at 8.0 m/s, the trout lands on top of the water fall 1.8 m high. how long was it in the air?

Agust of wind pushes a beach ball with a force of 9 newtons.the ball rolls 10 meters in 3 seconds. what is the power of the wind?

If you held a stone over the mouth of a well and then let it go , what would happen to the stone? explain your answer.