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