Question #9ed21

1 Answer
Jan 25, 2018

65ms

Explanation:

Suppose,the ball was projected vertically with velocity u

So,distance(s) covered in 5th second is u12g(251)

and, in 6th second is u12g(261)=(h)

Now,given,, s=2h

So, equating the obtained equations,we get, u=13g2

Now,if g=10ms2 ,then u=65ms