Question

An open elevator is ascending with zero acceleration and speed 10 m/s. A ball is thrown vertically up by
a boy when he is at a height 10 m from the ground, the velocity of projection is 30m/s with respect to
elevator. Choose incorrect option, assuming height of the boy very small : (g = 10 m/s²)
(1) Maximum height attained by the ball from ground is 90 m.
(2) Maximum height attained by the ball with respect to lift from the point of projection is 45 m.
(3) Time taken by the ball to meet the elevator again is 5 sec
(4) The speed of the ball when it comes back to the boy is 20 m/s with respect to ground.

(plz answer this question....)​

Answer 1

Answer:

Correct answer is 90 m

Answer 2

Answer:

90 m

90m.....

Explanation:

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