A hockey player weighing 50 kg moves at a speed of 8 m / s and hits with a stick in the direction of his movement

| August 8, 2021 | education

A hockey player weighing 50 kg moves at a speed of 8 m / s and hits with a stick in the direction of his movement on the puck m = o, 5 kg. After the impact, the puck moves at a speed of 100m / s. What is the speed of a hockey player after hitting with a stick?

To determine the value of the speed of a hockey player after hitting the puck, we apply the law of conservation of momentum: mx * Vx0 = mx * Vx + msh * Vsh, whence we express: Vx = (mx * Vx0 – msh * Vsh) / mx.

Values of variables: mх – hockey player’s weight (mх = 50 kg); Vx – the speed of the hockey player before hitting the puck (Vx = 8 m / s); msh is the mass of the washer (msh = 0.5 kg); Vsh – the speed acquired by the washer (Vsh = 100 m / s).

Calculation: Vx = (mх * Vx0 – msh * Vsh) / mx = (50 * 8 – 0.5 * 100) / 50 = 7 m / s.

Answer: After hitting the puck, the hockey player’s speed will decrease to 7 m / s.



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