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Question

From the top of a tower of height 40m, a ball is projected upwards with a speed of 20m/s at an angle of elevation of 300. The ratio of the total time taken by the ball to hit the ground to its time of flight (time taken to come back to the same elevation) is :

A
2:1
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B
1:2
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C
1:1
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D
3:2
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Solution

The correct option is A 2:1
Time of flight,
T=2vsinθg=2×20×sin30°10=2sec
Total time taken by the ball to hit the ground is
t=distancevelocity=4020sin30°=4020×12=4sec
So, the ratio is 4:2=2:1

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