If a rock is dropped from rest it will be traveling ____ in 4 sec if air resistance is neglected.

Science
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If a rock is dropped from rest it will be traveling ____ in 4 sec if air resistance is neglected.

May 30th, 2015

we know that distance travelled is given by

S = ut+ (1/2)gt^2

where u  : initial velocity = 0 m/s (Dropped)

t = time = 4sec   , g = accleration due to gravity = 9.8 m/sec^2

substituting values we get

S = 0*4 + 0.5 * 9.8* 4^2 = 78.4 m (Answer)

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May 30th, 2015

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