Question

A hockey ball of mass 200g travelling at 10m/s is struck by a stick so as to return it along its original path with a velocity at 5m/s .Calculate the change in momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.​

Answer 1

GIVEN:-

Mass of ball (m) = 200 g = 0.2 kg

Initial velocity of ball = 10 m

Initial momentum of ball = 0.2 kg x 10 m = 2 N s

Final velocity of ball = - 5 m (Minus sign denotes that ball is moving in opposite direction.)

Final momentum of ball = = 0.2 kg x -5 m= -1 N s

Change in momentum = Final momentum - Initial momentum = - 1Ns - 2Ns = - 3N s. (Minus sign denotes change in momentum in the direction opposite to the direction of initial momentum of the ball.

Answer 2

$\huge\mathfrak{HEYA..MATE!!}$

$\huge\bold\purple{Answer:-}$

Here, m= 200g= 0.2 kg, u= 10 m/s , v=-5 m/s

Change in momentum = m(v-u)= 0.2 (-5-10)

= -1 kg ms^-1

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