Projectiles A and B are thrown at angles of 45° and 60° 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 vA : vB is:
1
1 ∶ \(\sqrt3\)
2
\(\sqrt2\) ∶ 1
3
1 ∶ 2
4
\(\sqrt3\) ∶ \(\sqrt2\)
5
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