Question

From the top of a tower 19.6m high, a ball is thrown horizontally. If the line joining the point of projection to the point where it hits ground makes an angle of 45 degree with the horizontal then initial velocity of ball is: a. 9.8 m/s b. 4.9 m/s c. 14.7 m/s d. 2.8 m/s

Answer 1

Explanation:

Given height h=19.6 m; θ=450

We know time=g2h=9.82×19.6=4=2 

Also we know velocity =TimeDistancetravelled=219.6=9.8m/s