An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will

move in the opposite direction at a lower speed

move in the opposite direction at 20 m/s

move in the opposite direction at a higher speed

The force on a dropped apple hitting the ground depends upon

the time of contact with the ground

the speed of the apple just before it hits

whether or not the apple bounces

The dimensional formula of momentum is given by,

[M¹ L¹ T^-1]

Where,

Momentum (M) = Mass × Velocity . . . . . (1)

The dimensional formula of velocity = [M⁰ L¹ T^-1] . . . . (2)

And, the dimensional formula of mass = [M¹ L⁰ T⁰] . . . . (3)

On substituting equation (2) and (3) in equation (1) we get,

Momentum = Mass × Velocity

Or, M = [M¹ L⁰ T⁰] × [M⁰ L¹ T^-1] = [M¹ L¹ T^-1]

Therefore, momentum is dimensionally represented as [M¹ L¹ T^-1].

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