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Q.

Height of the body from the ground can be calculated by using the formula h = – ut + (1/2)gt2 in
a) A body projected vertically with velocity 'u' from the top of tower, reaches the ground in 't' sec.
b) A body dropped from a balloon moving up with uniform velocity, reaches the ground in 't' sec
c) A body dropped from a helicopter moving up with uniform velocity, reaches the ground in 't' sec
d) A body projected vertically from the ground reaches the ground in 't' sec.

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a

a is only correct

b

a, b and c are correct

c

b and d are correct

d

a, b, c and d are correct

answer is A.

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Detailed Solution

h=-ut+12gt2

This equation is written under the assumption that upward physical quantities are negative and down ward physical quantities are positive. That implies initial velocity u is in opposite direction of acceleration due to gravity.  

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Height of the body from the ground can be calculated by using the formula h = – ut + (1/2)gt2 ina) A body projected vertically with velocity 'u' from the top of tower, reaches the ground in 't' sec.b) A body dropped from a balloon moving up with uniform velocity, reaches the ground in 't' secc) A body dropped from a helicopter moving up with uniform velocity, reaches the ground in 't' secd) A body projected vertically from the ground reaches the ground in 't' sec.