A tennis ball is hit to a player, who hits it back in the opposite direction. If

Question

A tennis ball is hit to a player, who hits it back in the opposite direction. If the ball (mass .12kg) has an initial speed of 37m/s and is returned with a speed of 25m/s, what is the magnitude of the impulse imparted to the ball?

Am I correct in my answer?

Impulse = delta P

P = momentum; which = mass * velocity

so,

mv1 = .12kg(37m/s)

= 4.44

mv2 = .12kg(25m/s)

= 3

delta p = 1.44.

Would this equal the impulse or am I completely off base here. If Im wrong, please show the correct answer and work. Thanks,

Explanation / Answer

you are wrong, because p1 and p2 have opposite direction so that delta p = 3-(-4.44)=7.44(kgm/s)

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