A 56-kg skater initially at rest throws a 4.0-kg medicine ball horizontally to t

Question

A 56-kg skater initially at rest throws a 4.0-kg medicine ball horizontally to the left. Suppose the ball accelerated through a is distance of 1.0 m before leaving the skaters hand at a speed of 7.0 m/s. Assume the skater and the ball to be point-like, the surface to be frictionless, and ignore air resistance. Use a vertical y axis with the positive direction pointing up, and a horizontal z-axis with the positive direction pointing to the right. Determine the acceleration of the ball during the throw. Determine the acceleration of the skater during the throw.

Explanation / Answer

vf^2-vi^2=2ad
a= vf^2-vi^2/2d
=(7.0)^2 - (0)^2/2(1m)
=24.5m/s^2

=(4kg)(24.5m/s^2)
98N

a = F/m
98N/56kg
=1.75 m/s^2

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