Question

Assertion: An object can have kinetic energy can never have zero velocity. Reason: Kinetic energy depends on mass and but not on velocity.

Power is defined as the rate of doing work. A cyclist is moving along a flat road. He has a mass of 70 kg and is pedaling to maintain a constant speed of 5 m/s. The cyclist experiences a frictional force of 20 N acting opposite to the direction of motion.

A force F = (5î + 3ĵ) newton is applied over a particle which displaces it from its origin to the point r = (2î − 1ĵ) metres. The work done on the particle is

A particle is acted upon by a force of constant magnitude, which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that