Question

15. A stone dropped from the top of a tower reaches the ground in 4 seconds. The height
of the tower is about:
(A) 20 m
(B) 40 m
(C) 80 m
(D) 160 m please tell step by step explaination​

Answer 1

Correct question:-

A stone is dropped from the top of a tower reaches the ground in 4 seconds.The height of the tower is about:

(A)20m

(B)40m

(C)80m

(D)160m

Given:-

→Time taken by the stone to reach ground=4s

To find:-

→Height of the tower

Solution:-

•The initial velocity of the stone in this case will be 0,as it was initially at rest.

•In order to get a perfect answer,in this case,we shall take the value of g(acceleration due to gravity) as 10m/s².

Now,by using the 2nd equation of motion,we get:-

=>h=ut+1/2gt²

=>h=0×4+1/2×10×(4)²

=>h=5×16

=>h=80m

Thus,height of the tower is 80m and hence,correct option is (C).