Question

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.

Assertion: A light body and heavy body have same momentum. Then they also have same kinetic energy. Reason: Kinetic energy does not depend on mass of the body.

Assertion: The instantaneous power of an agent is measured as the dot product of instantaneous velocity and the force acting on it at that instant. Reason: The unit of instantaneous power is watt.

Power of a water pump is 2 kW. If g = 10 m/s², then find the amount of water it can raise in on minute to a height of 10 m.