4 20 N effort is used in the 20 cm long spanner to unscrew a nut, then
calculate momentum to unscrew the nut.

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

Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.

Which subatomic particle has a negative charge