1. A 20,000 kg loaded railroad car is traveling alone on a level, frictionless track with a speed of 20 m/sec. An additional weight of 5,000 kg falls down onto the car. What will be the speed of the car now?

2) A 90 kg fullback is traveling 5.0 m/s and is stopped by a tackler in 10 s. Calculate
a) the original momentum of the fullback
b) the impulse imparted to the tackler
c)the average force exerted on the tackler

A baseball is hit off the edge of a cliff horizontally at speed of 30 m/s. It takes the ball 3 seconds to reach the ground, with no air resistance.
A) How far from the cliff wall does the ball land?
B) How high is the cliff wall?

1. A horse exerts 1200N force to pull a 600 kg load 80 m. How much work did the horse do?

2. A 100 kg rocket has 2,000,000 joules of kinetic energy. How fast is it moving?

3. How much work is required to stop a 1000 kg car traveling at 10 m/s?

4. A 10 kg monkey swings from one branch to another 3 m higher, What is it's change in potential energy?

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1. Use P = Fv

2. (a) p = mv
(b)
(c)

3. (a) s = ut
(b)

4. W = Fd

5.

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