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Grade: 11

                        

A ball thrown up in a vacuum returns after 12 seconds.Its position after 4 seconds will be the sameas after:(a) 2 second (b) 6 second(c)8second(d)10second

A ball thrown up in a vacuum returns after 12 seconds.Its position after 4 seconds will be the sameas after:(a)  2 second (b) 6
second(c)8second(d)10second

2 months ago

Answers : (1)

Anand Kumar Pandey
askIITians Faculty
4371 Points
							Dear Student

total time = 12sec
for t=12 sec, displacement y=0
so
ut=.5xgxt2
u=60 m/s
for t= 4 sec, y=160m
let the required time be t
y=160 @time =t
by y=ut – (1/2)gt2
t= 8 sec


Thanks
2 months ago
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