Someone can help with physics quesiton?

Posted on 2014-12-18 08:14:00 in Physics by STEFAN

1) A 0.65 kg rubber ball has a speed of 2.0 m/s at point A and kinetic energy of 9.0 J at point B.

(a) Determine the ball's kinetic energy at A.

(b) Determine the total work done on the ball as it moves from A to B.

2) An 80 g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow over a distance of 81 cm. What is the speed of the arrow as it leaves the bow (Use the work-energy theorem to solve this -- the bow string does work on the arrow)?

3) A 47.0 kg diver steps off a 12.0 m high diving board and drops straight down into the water. If the diver comes to rest 5.0 m below the surface of the water, determine the average resistance force exerted on the diver by the water.

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