A trolley of mass is moving towards the east with a speed of
PHYSICS · Multi-part · CBSE · Physics · Force and Laws of Motion · Force and Laws of Motion
Problem
A trolley of mass 5kg is moving towards the east with a speed of 2ms−1. A motor fitted to the trolley causes it to speed up to 8ms−1 in a straight line during a time interval of 3s. Neglect any external horizontal forces other than the motor thrust.
(i) Write the expression for the linear momentum of the trolley at any instant.
(ii) Calculate the change in momentum of the trolley during the 3s interval.
(iii) Determine the magnitude of the average horizontal force exerted by the motor on the trolley in this interval.