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At time t=0 a small ball is projected from point A with a velocity of 60 m/s at 60 degree angle with horizontal. Neglect atmospheric pressure and determine the two times t1 and t2 when the velocity of the ball makes an angle of 45 degree with the horizontal x-axis.

At time t=0 a small ball is projected from point A with a velocity of 60 m/s at 60 degree angle with horizontal. Neglect atmospheric pressure and determine the two times t1 and t2 when the velocity of the ball makes an angle of 45 degree with the horizontal x-axis.

Grade:11

2 Answers

abhishek saroha
18 Points
9 years ago

for first time ucos60=vcos45.....we get v=30root2

putting this value we get t1=30(root3-1) now cal t2 urself if have problem then ask me at asabhishek33@gmail.com

rasna srk
14 Points
9 years ago

velocity along horizintal direction remains constant

60cos60=vcos45

and 60sin60-gt=vsin45

solving gives t1=3(root three-1)

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