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A stone is thrown upwards from top of a tower with some initial speed and it reaches the ground in t1 seconds. Now it is thrown with the same initial speed downward and it reaches the ground in t2 sec. In how much time will it reach the groundif the stone is allowed to fall freely under gravity from the same place ?a)b)c)d)

Radhika Batra , 10 Years ago
Grade 11
anser 1 Answers
Vikas TU

Last Activity: 8 Years ago

For first case:
-h = ut1 – 0.5gt1^2     .....(1)
For second case:
h = ut2 + 0.5gt2^2      ......(2)
For third case:
h =  0.5gt3^2          .........(3)
Solve eqns. (1) and (2) and get u and h.
put h in eqn (3)
to get t3.

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