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# Calculate the acceleration due to gravity, g.

A ball is thrown upward from the ground. It passes a window 10 m above the ground and is seen to descend past the window 2.2 s after it went by on its way up. It reaches the ground 3.6 s after it was thrown.

The acceleration due to gravity on earth is a constant and it is around 9.8m/s.

Therefore there is no need to actually do a calculation with figures as you already know if you are asked to calculate it and assuming you are on earth then this is the answer that you will get, a handy little shortcut for you ;)

By: knowitall
Replied at: 21 Sep 2009

Average rating for this answer is 2.33 / 5

Suppose,maximum height=h and accn. due to gravity=g. Now,h+10=(1/2)g(1.8)^2 or,h+10=1.62g .........(1) and, h=(1/2)g(1.1)^2 or, h=0.605g ........(2) Solving equations (1) and (2), we get the value of g = 9.85m/s^2
By: psahu63

Date of comment: Thu, Sep 2nd 2010

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