Projectiles A and B are thrown at angles of 45° and 60° with vertical respectively from top of a 400 m high tower.

Question

Projectiles A and B are thrown at angles of \(45^ \circ\) and \(60 ^\circ \) with vertical respectively from top of a 400 m high tower. If their ranges and times of flight are same, the ratio of their speeds of projection \(v_A :v_B\) is

(1) \(1: \sqrt {3}\)

(2) \(\sqrt {2}: 1\)

(3) 1 : 2

(4) \(1 : \sqrt {2}\)

(5) None of these

Answer 1

(5) None of these

For \(u_A\) & \(u_B\) time of flight and range can not be same.