A rock falls from rest from a height of 490 m. How long does it take to reach the ground?

1 Answer
Jane
Feb 25, 2018

#10 s#

Explanation:

As,the rock is falling down solely due to the effect of gravity,we can apply the equation, #s=1/2g t^2# to calculate the time required to cover certain amount of distance.

Given, #s=490 m#

So, #490= 1/2*9.8*t^2#

or, #t=sqrt(100)=10 s#

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