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in Physics by (70.8k points)

A pebble is thrown horizontally from the top of a 20m high tower with an initial velocity of 10m/s. The air drag is negligible. The speed of the pebble when it is at the same distance from top as well as base of the tower (g = 10 m/s2)

(A) 10√2m/s 

(B) 10√3m/s 

(C) 20 m/s 

(D) 25 m/s 

1 Answer

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Best answer

Correct option (B) 10√3m/s

Explanation:

The pebble is at same distance from top and base of the tower after it falls down by a distance h = 10 m. 

Applying conservation of energy.

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