Question

I need help with those 2.

1. Tiger Woods hits a 0.045 kg golf ball, giving it a speed of 70 m/s. What is the impulse does the golf club exert on the ball? If the club was in contact with the golf ball for 0.1s, what is the average force of the club on the ball?

2. Luis hits a 0.13 kg hockey puck with a force of 300 N and his stick is in contact with the puck for 0.04s. If the puck starts from rest, how fast is the puck moving when it is leaving contact with the stick?

Answer 1

Hi there!

Question 1:

We know that Impulse = Δp = mΔv, so:

I = 0.045(70) = 3.15 Ns

I = F · t, so:

3.15/0.1 = F

F = 31.5 N

Question 2.

We can find the impulse using:

I = Ft

I = 300 · 0.04 = 12 Ns

Find the change in velocity using:

I = mΔv

12/0.13 = Δv = 92.31 m/s