6.A simple pendulum hangs from the roof of a moving train. The string is inclined towards the rear of the train. What is the nature of motion of the train?

7.The normal reaction on a body placed in a lift moving up with constant acceleration 2 m/square second is 120N. Mass of body is: (Take g = 10 m/square second)

8.The coefficient of kinetic friction between a 20 kg box and the floor is 0.40. How much work does a pulling force do on the box is pulling it 8.0 m across the floor at constant speed? The pulling force is directed 37 degree above the horizontal:

9.The action and reaction forces referred to newtons third law of motion:

10.A uniform chain is coiled up on a horizontal plane and one end passes over a small light pulley at a height a above the plane. Initially, a length b hangs freely on the other side. If b = 2a: