1. A hockey player hits a puck weighing 0.25kg with a +55 N force. If the hockey stick is in contact with the puck for .1 s and a displacement of +0.80m, find the:

(a) power dissipated (hint, use P = W/t)

(b) puck's acceleration (hint, use a = F/m)

(c) impulse (hint, use J = Ft)

(d) work done (hint, use W = Fd)

2. A 1200kg car slows down using an average braking force of 1400N over a time interval of 10s. If the distance it travels while slowing down is 120m:

(a) What impulse does the car experience?

(b) What is the car's acceleration?

(c) How much work has been done on the car?

(d) How much power is used in stopping the car?

3. A soccer ball with a mass of 0.42 kg is accelerated at a rate of +800.0 ^m/_s² over a time interval of 0.010s by a soccer player's kick. If her foot is in contact with the ball for a distance of +1.0cm find:

(a) the force the soccer player exerts on the ball.

(b) the impulse applied to the ball.

(c) the work done by the kicker on the ball.

(d) the power of the player's kick.

4. A 0.14 kg baseball is pitched at a speed of 35 m/s. If it is hit straight back at the pitcher with a force of 5400N exerted over a time interval of 1.0 millisecond, find:

(a) the acceleration of the baseball (hint, use a = F/m)

(b) the impulse given to the baseball (hint, use J = Ft)

(c) the change in momentum of the baseball (hint, p = J)

(d) the initial momentum of the baseball (hint, p_i = mv)

(e) the final momentum of the baseball (hint, p_f - p_i = p, so p_f = p + p_i

(f) the final velocity of the baseball (hint, use v_f = ^p_f / _m)

(g) the distance that the baseball was in contact with the bat (hint, use d = v_avet)

5. A ball falls for 9.0s increasing its kinetic energy by 2700 J. If the force acting on the ball is 6.0 N find the following quantities:

(a) change in potential energy (hint, GPE = KE)

(b) work done by the ball (hint, W = KE)

(c) distance the ball falls in 9.0s

(d) mass of the ball

(e) power dissipated by the fall

(f) impulse the ball experiences

(g) change in momentum

(h) change in velocity

(i) average velocity

(j) initial velocity

(k) final velocity

(l) initial momentum

(m) final momentum