Question

A particle is projected with velocity 20√3m/s at an angle of 60° with the horizontal. The speed of the particle when it's velocity becomes perpendicular to velocity of projection is:
A. 10√3m/s
B. 20m/s
C. 20/√3m/s
D. 10m/s
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Answer 1

Answer:

B. 20 m/s is the correct answer

see the attachment please

Explanation:

Hope the answer will help you

Answer 2

the same question may get a bit twisted if asked after what time this condition is acheived.

if simply asked for speed then the other method is time saving