Question

23. A body is thrown vertically upward, such that the
distance travelled by it in fifth and sixth seconds
are equal. The maximum height reached by the
body is
(1) 30 m
(2) 60 m
(3) 125 m
(4) 120 m​

Answer 1

Answer:

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Explanation:

When a body is projected upwards it is acted upon by the gravitational force.

The distance it travels in the preceding second is always more than the distance it covers in the next second.

For these distances to be equal, the the object should reach the maximum height in the preceding second.

In our case the object reaches maximum height in the sixth second.

At maximum height the final velocity is 0.

Taking g = 9.8 we have :

V = u - gt

V = 0

0 = u - 9.8 × 6

U = 58.8

The initial velocity is thus :

= 58.8 m/s=60m/s

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