Question

A motercycle is moving with a velocity od 90km/h and it takes 5 sec to stop after the brakes are aplyied calculate the force exerted by the brake on the motercycle if its mass along with rider is 200kg

Answer 1

F = m a 
a = (v - u) / t = (-90 * 5/18) /5  = -5 m/s^2

F = - 1000 N