Question

A 54-kg ice skater pushes off the wall of the rink, giving herself an initial speed of 3.5 m/s . She then coasts with no further effort. The frictional coefficient between skates and ice is 0.022. how far does she go before she stops?

Answer 1

Mass of skater = 54 kg Initial speed V_i = 3.5 m/s friction f = mu mg Retardation a = F/m = mu Hg/m = mu g = 0.022 times 9.8 let she travel 'd' distance and comes to a stop, final speed = 0 By third equation of motion V_f^2 = V_i^2 + 2ad 0 = (3.5)^2 - 2 times(0.022 times 9.8) times d d = 28.4 m