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A ball is projected from ground with velocity 40m/s . After two seconds, the velocuveof ball becomes horizontal. The angle of projection of ball with horizontal is

A ball is projected from ground with velocity 40m/s . After two seconds, the velocuveof ball becomes horizontal. The angle of projection of ball with horizontal is
 

Grade:11

1 Answers

Saurav
224 Points
5 years ago
30°  
The velocity of particle is horizontal at highest point of motion therefore time taken to reach at highest point is 2s
Therefore time of flight will be two times 2s that is 4s 
Now apllat=(2usintheta )/g
U get sintheta =half
Theta is 30°
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