# Homework Help: Finding Work From Impulse

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1. Mar 1, 2016

### x2017

1. The problem statement, all variables and given/known data

Consider the following two scenarios.
(A) A pitcher throws a ball at -55m/s and the batter swims at 25m/s.
(B) A pitcher throws a ball at -25m/s and the batter swings at 55m/s.
The ball has a mass of 0.15kg and the bat has a mass of 1kg. Assume that the impact between the ball and the bat lasted for 0.3s, the coefficient of restitution was 0.5 and that the force of impact maintained a constant value throughout impact.

Question a) For both scenarios: what impulse was exerted on the ball by the bat?
Question b) For both scenarios: how much work was done on the ball by the bat?

2. Relevant equations

ΣFΔt=mΔv
W=FΔd

3. The attempt at a solution

I thiiiink that I got question a)

(A)
ΣFΔt=mΔv
ΣFΔt=(1)(25)
ΣFΔt=25Ns

(B)
ΣFΔt=mΔv
ΣFΔt=(1)(55)
ΣFΔt=55Ns

I am unsure of how to go from impulse to calculate work in question b).

2. Mar 1, 2016

### x2017

Never mind, I think I got it! Realized I did part a) wrong and was able to get b).