Motion In A Plane

At t = 0, truck, starting from rest, moves in the positive x-direction at uniform acceleration of 5 ms^\(-\)2. At t = 20 s, a ball is released from the top of the truck. The ball strikes the ground in 1 s after the release. The velocity of the ball, when it strikes the ground, will be :

(Given g = 10 ms^\(-\)2)