A 500 g hockey puck is travelling headon at 33.0 m/s toward agoalie\'s pads. The

Question

A 500 g hockey puck is travelling headon at 33.0 m/s toward agoalie's pads. The goalie , initially at rest and completelypadded, has a mass of 75 kg. The puck causes the goalie's padto be compressed by 3 cm and pushes her backward at 0.30m/s. calculate the velocity of the puck after collision. A 500 g hockey puck is travelling headon at 33.0 m/s toward agoalie's pads. The goalie , initially at rest and completelypadded, has a mass of 75 kg. The puck causes the goalie's padto be compressed by 3 cm and pushes her backward at 0.30m/s. calculate the velocity of the puck after collision.

Explanation / Answer

A 500 g hockey puck is travelling headon at 33.0 m/s toward agoalie's pads. The goalie , initially at rest and completelypadded, has a mass of 75 kg. The puck causes the goalie's padto be compressed by 3 cm and pushes her calculate
initial kinetic energy of hockey cup=1/2*0.5*33*33=272.25J energy utilised in pushing 75kg pad through 3cm and also inmoving backward at 0.30m/s.=75*9.8*0.03+1/2*75*0.3*0.3=22.05+3.375=25.425J remaining energy=272.25-25.425=246.825J so the velocity of the puck aftercollision.=1/2mv2=246.825J so v=31.42m/s

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