First slide

Second law

Question

A batsman deflects a ball by an angle of 60⁰ without changing its initial speed of 20 ms^–1. what is the impulse imparted to the ball if its mass is 0.15 kg?

Moderate

A

9 N-S
B

6 N-S
C

3 N-S
D

1 N-S

Solution

$\large |\vec p_i|=|\vec p_f|=p$
$\large |\Delta\vec p_i|=$ Magnitude of change of momentum
= 2psinθ/2 = 2mvsinθ/2
$\large \therefore$ Impulse = change in momentum
= 2 x 0.15 x 20 x sin30⁰
=3 N-S

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