Question

A piece of marble is projected from earth's surface with
velocity of 19.6 root 2 m/s at 45°. 2 s later its velocity makes an
angle a with horizontal, where a is
(a) 45°
(b) 30°
(c) 60°
(d) 0°​

Answer 1

Answer:

d) 0°

Explanation:

T = 2usin x°/g

= 2×19.6√2/√2×9.6

= 4 sec

at 2 sec the body will be at highest point of its projectile. at highest point the velocity will be parallel to the horizontal in the same direction.

so, it makes 0° with horizontal at 2sec.