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A hockey ball of mass 200 g travelling at 10 m s⁻¹ is str... - Science
A hockey ball of mass 200 g travelling at 10 m s⁻¹ is struck by a hockey stick so as to return it along its original path with a velocity at 5 m s⁻¹. Calculate the magnitude of change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.
The calculation for the change in momentum:
Given:
Mass (m) = 200 g = 0.2 kg
Initial velocity (u) = 10 m/s
Final velocity (v) = -5 m/s (negative sign indicates it's returning in the opposite direction)
Initial momentum (p_initial) = m x u = 0.2 kg x 10 m/s = 2 kg m/s
Final momentum (p_final) = m x v = 0.2 kg x (-5 m/s) = -1 kg m/s
Change in momentum (Δp) = p_final - p_initial
Δp = -1 kg m/s - 2 kg m/s = -3 kg m/s
The magnitude of the change of momentum is 3 kg m/s.