Question

4. A stone is dropped from a
tower of height 80 meters.
What is the distance from the
ground after three seconds
O 47.3 m
O 31.4 m
O 35.9 m
O 44.1 m​

Answer 1

Explanation:

Very simple. One point is to be noted that there is not mentioned “from where” we measure the distance. Generally, we measure from ground, so, here we follow the same.

Now, the stone falls by the acceleration due to gravity g=9.8 m/s^2.

So, after 4 seconds it will reach ,

s=1/2 gt^2

==> 1/2 ×9.8× 16

==> 78.4 m ,from the point where it is just dropped.

So, the stone will be (80–78.4)=1.6 meters above the ground.

Thank you.