Question

A person standing on a truck moving with a uniform velocity of 14.7 ms^-1 on a horizontal road throws a ball in such a way that it returns to him after 4s. Find the speed and angle of projection as seen by a man on the road ______.

Options

• 19.6 ms^-1, vertical

• 24.5 ms^-1, vertical

• 19.6 ms^-1, 53° with the road

• 24.5 ms^-1, 53° with the road

Answer 1

A person standing on a truck moving with a uniform velocity of 14.7 ms^-1 on a horizontal road throws a ball in such a way that it returns to him after 4s. Find the speed and angle of projection as seen by a man on the road 24.5 ms^-1, 53° with the road.

Explanation:

`u_x = 14.7` m/s;

`u_y = 9.8 xx 2 = 19.6` m/s

`u = sqrt((14.7)^2 + (19.6)^2)`

= 24.5 m/s

`tantheta = 19.6/14.7 = 4/3`

⇒ `theta = 53^circ`