question_answer 6)

A stone of 1 kg is thrown with a velocity of 20 m s–1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?

Answer:

Here,                                                      From,                                                                   or                                       ,                                                 Negative sign indicates that force of friction is opposing the motion of the ball.