Question

A ball is projected with a speed of 20m/s at an angle of 30^(@) from a point on the top of a very high tower.The time after which its velocity becomes perpendicular to the velocity of projection (take g=10m/s^(2) ) is (A) 0.5sec (B) 2sec (C) 4sec (D) never

Answer 1

Answer:

a(250)

Explanation:

b(28)

c(36)