Question

A stone dropped from the tower 490 metre high. How long will it
take to reach the ground.
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Answer 1

Answer:

depending upon his speed / velocity

Answer 2

Answer:

For the stone that is dropped from the top of a cliff 490 m high, s = 490, a = 9.8 and u = 0.

Substituting these values gives:

490 = 0*t + (1/2)*9.8*t^2

=> t^2 = 490*2/9.8

=> t^2 = 100

=> t = 10 s

here 9.8 is the acceleration due to gravity