61.
While catching a ball, a player pulls down his hands to lower the–

62.
Momentum is measured as the product of :

63.
Two stones of different masses are dropped simultaneously from the top of a building

64.
A man jumping out of a moving train is thrown

65.
An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's

66.
What is the force of attraction between any two bodies by virtue of their masses is called?

67.
If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will

68.
When a bar magnet is cut into two equal halves, the pole strength of each piece –

69.
A permanent magnet can affect

70.
A freely suspended magnet remains horizontal at