Caution! Slippery Surface!

You went to a park in winter to practice ice skating on a frozen lake, but because you're a beginner, you asked your friend to give you some impulse to start.

He applied a force of 150 Newtons to you during 1.2 seconds, after which you began moving with a constant velocity.

Another person is skating toward you with a velocity of 5 m/s. Unable to stop, you both collide and both stop moving.

Suppose that you have a mass of 60kg. Find the mass (in kilograms) of the person who collided with you.

Details and assumptions: Because the lake is frozen, the icy surface causes negligible friction.


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