# What is meant by free fall? A ball is dropped from the roof of a building. It take 10 seconds to reach the ground. Find the height of the building.

(g=9.8m/s2) .

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(g=9.8m/s2) .

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sol. t = 10s

g = 9.8 m s^-2

S = ut+1/2at2

s=0+1/2*9.8*10*10

s=490m

When an object falls from any height under the influence of gravitational force only, it is known as free fall. In the case of free fall no change of direction takes place but the magnitude of velocity changes because of acceleration.

This acceleration acts because of the force of gravitation and is denoted by ‘g’. This is called acceleration due to gravityS = ut+1/2at2

s=0+1/2*9.8*10*10

s=490m