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Standard XII

Physics

Summary for Time, Height and Range

An elevator c...

Question

An elevator can (lift) is moving upward with uniform acceleration of $2 m / s^{2}$ . At the instant, when its velocity is $2 m / s$ upwards a ball is thrown upward from its floor. The ball strikes back the floor $2$ s after its projection. Find the velocity of projection of the ball relative to the lift.

10 m / s ↑

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10 m / s ↓

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12 m / s ↑

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12 m / s ↓

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Solution

The correct option is C $12 m / s ↑$
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A very broad elevator is going up vertically with a constant acceleration of $2 m / s^{2}$ . At the instant when its velocity is $4 m / s$ a ball is projected from the floor of the lift with a speed of $4 m / s$ relative to the floor at an elevation of $30^{\circ}$ . The time taken by the ball to return the floor is ( $g$ = $10 m / s^{2}$ ) from time of projection.

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An elevator can (lift) is moving upward with uniform acceleration of 2m/s2. At the instant, when its velocity is 2m/s upwards a ball is thrown upward from its floor. The ball strikes back the floor 2 s after its projection. Find the velocity of projection of the ball relative to the lift.

The correct option is C 12m/s↑undefined

The correct option is C $12 m / s ↑$
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