A young hockey player on frictionless ice shoots a 1 kg hockey puck 150 m/s toward the goal. of the hockey player slides backward at 3m/sec what is his mass?

By conservation of linear amount of movement we have:

m1v1i + m2v2i = m1v1f + m2v2f

Where,

v1i = v2i = 0 (assuming initial rest)

m1v1f + m2v2f = 0

Substituting the values:

m1 (-3) + (1) (150) = 0

Clearing m1:

m1 = ( - (1) * (150)) / ( - 3)

m1 = 50 Kg

answer:

his mass is 50 Kg