Question

A stone released into the

rriver from a bridge .it takes
4s for the stone to touch
the river's water surface
Complete the height of
the bridge from the water
Level​

Answer 1

h = 78.4 m

Step-by-step explanation:

Given that,

A stone takes 4s for the stone to touch the river's water surface.

We need to find the height of the bridge from the water level​.

Let the height be h. We can use the second equation of motion to find h. So,

`h=ut+(1)/(2)gt^2\\\\ \because u=0\\\\So,\\\\h=(1)/(2)* 9.8* 4^2\\\\h=78.4\ m`

So, the height of the bridge from the water level is 78.4 m.