A Child drops a ball from a height of 10m its velocity increases at the rate of 10 M/s^2.find ? A)The velocity with which the ball strikes the ground. B)Time taken by the ball to reach the ground.

2 Answers
Jun 8, 2018

#v=10sqrt2# #ms^-1#
#t=sqrt2# sec

Explanation:

If the ball is dropped gently, we consider initial velocity to be 0.
#color (green)(u=0#

We have equations of motion which are valid here because of constant acceleration.

#color (blue)(2as=v^2-u^2)#

Just putting values as in your case

#2*10*10=v^2-0^2#

#200=v^2#

#color(indigo)(10sqrt2=v#

Now using #v=u+at#

#10sqrt2=0+10t#

#t=sqrt2# sec

Jun 8, 2018

I tried this:

Explanation:

Have a look:
enter image source here