(a) Prove algebraically that if the speed of a body is increased to times its initial…
PHYSICS · Multi-part · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
(a) Prove algebraically that if the speed of a body is increased to n times its initial value, its kinetic energy becomes n2 times the initial kinetic energy.
A cart of mass 25kg is initially moving on a straight track with a speed of 2m/s. A constant horizontal force acts on the cart for 10s, increasing its speed to 6m/s.
(a) (b) Calculate the initial kinetic energy of the cart.
(b) (c) Calculate the final kinetic energy of the cart after the force has acted.
(c) (d) Determine the work done by the force on the cart.
(d) (e) Hence calculate the magnitude of the force applied.