# Answer to Question #4941 in Mechanics | Relativity for sarah

Question #4941

a book falls from a shelf 160cm above the floor .Find the speed with which the book strikes the floor.

Expert's answer

Here we can use standard formula for motion with an acceleration: V = gt.

All we need is to find the time of falling t. We know that H = (gt^2)/2.

So, t = sqrt(2H/g) = sqrt(2*1.6/9.8) = 0,571 s.

At last, V = gt = 9.8*0.571 = 5,596 m/s.

All we need is to find the time of falling t. We know that H = (gt^2)/2.

So, t = sqrt(2H/g) = sqrt(2*1.6/9.8) = 0,571 s.

At last, V = gt = 9.8*0.571 = 5,596 m/s.

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