. Calculate the momenturn of a bus of mass 2000 kg moving with a velocity of 20 m/s​

Abody of weight 60 kg is standing in a lift the lift going upward with a uniform velocity of 4.9 metre per second slows down and stops in two seconds then apparent weight of the body during the slow down process is

The current in a hair dryer measures 11 amps. the resistance of the hair dryer is 12 ohms. what is the voltage?unit:

What does the law of conservation of mass state?