Question

A stone falls off from a tower and drops to the ground in 0.5 s. At what speed the stone will strike the ground ?.Find height of the tower ?​

Answer 1

Answer:

Given,

time taken=0.5s

g=10ms−2

As the stone is under free fall, the initial speed is zero.

(a) Under free fall, 

u=0 

a=g

v=u+at

v=0+10×0.5

v=5ms−1

(b) Average speed = 2u+v=20+5=2.5ms−1

(c) From newton's equation of motion, As u=0,

h=ut+21gt2

When h is the height, t is the time of free fall, g is the acceleration due to gravity. Putting the values in the above equation, we get

h=21×10×(0.5)2=5×0.25=1.25m

Explanation:

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