As the train starts moving, the head of the passenger sitting inside leans backward because of –

A bus is moving along a straight path and takes a sharp turn to the right side suddenly. The passengers sitting in the bus will-

A man is standing on a sensitive balance. If he inhales deeply, the reading of the balance –

A person of mass 60 kg is standing on a spring balance inside a lift. If the lift falls freely downwards, then the reading of the spring balance will be equal to :

A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. this enables the goalkeeper to -

A bus starting from a bus-stand and moving with uniform acceleration attains a speed of 20 km/h in 10 minutes. What is its acceleration?