Astudent drops a rock from a bridge to the
water 12 m below.
with what speed does the rock strike
the water?
answer in units of m/s

15.49m/s

Explanation:

Using one of the equations of motion;

= + 2gs

Where;

v = the final velocity of the rock.

=> This is the speed at which the rock strikes the water.

u = initial velocity of the rock.

=> The rock is just dropped from that height. That means the initial velocity is zero (0).

=> u = 0

g = the acceleration due to gravity.

=> Since the rock moves downwards, the acceleration due to gravity is positive and let it have a value of 10m/

=> g = 10m/

s = the distance covered by the rock

=> s = 12m

Substituting these values into the equation above gives

= + 2(10 x 12)

= 240

v =

v = 15.49m/s

Therefore the velocity(speed) with the rock strikes the water is 15.49m/s

hope that will help you