Question

You are stuck in the middle of a frictionless frozen lake without any reception.

To get back to the shoreline, you decide you must throw your phone away. You throw it with a velocity of 20.0 m/s, at an angle of 10° above the horizontal. If your mass is 20.0 kg and your phone is 100 g, what is your speed

after you throw your phone

Answer 1

(1) mass of person M = 20 kg;

mass of phone m = 0.1 kg;

horizontal speed of phone can be obtained by resolving the velocity in horizontal direction, thus;

linear momentum of the phone;

since surface is frictionless, so momentum is conserved thus;

(in the opposite direction to the ball)