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+4 votes
24.7k views
in JEE by (475 points)

If at an instant the velocity of a projectile be 60 m/s and its inclination to the horizontal be 30o , at what time interval (in sec ) after that instant will the particle be moving at right angles to its former direction. (g=10 m/s2) .

1 Answer

+2 votes
by (20.4k points)
selected by
 
Best answer

Please see here is the general formula derivation for your question.

You simply put the values and get the required answer

by (10 points)
How could we do this question by geometry???

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