a ball is projected vertically upwards with a velocity of 20 meters per second returns back on the ground with velocity of 16 meter per second if the resistance in propotional to the speed of ball find the air time of ball . acceleration of free fall is 10 m/s
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HEY MATE,
Time to reach maximum height can be obtained from v=u+at
0=20+(−10)t
t=2s
s=ut+0.5at
2
=20(2)+0.5(−10)(2)
2
=20m
Thus, total distance for maximum height is 45 m
s=ut+0.5at
2
45=0+0.5(10)(t
′
)
2
t
′
=3s
Total time= 3+2= 5s
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