At what speed do a bicycle and its rider, with a combined mass of 100 kg, have t

Question

At what speed do a bicycle and its rider, with a combined mass of 100 kg, have the same momentum as a 1500kg car traveling at 1.8m/s ?

Express your answer to two significant figures and include the appropriate units.

An ice hockey puck slides along the ice at15m/s . A hockey stick delivers an impulse of4.8kg?m/s causing the puck to move off in the opposite direction with the same speed.

What is the mass of the puck?
Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

momentum = mass x velocity

100v = 1500 x 1.8

v =27 m/s

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Impulse= change in momentum = m*final v - m *initial v

4.8 = m ( 15 - (-15))

m = 0.16 kg

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