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A balloon starts from ground with acceleration of 1.25 metre per second square and after 8 sec a stone is released from it so after how much time stone will reach the ground?

A balloon starts from ground with acceleration of 1.25 metre per second square and after 8 sec a stone is released from it so after how much time stone will reach the ground?

Grade:9

1 Answers

Apoorva Arora IIT Roorkee
askIITians Faculty 181 Points
6 years ago
The ballon starts from rest. We make use of the equation
S=ut +\frac{1}{2}at^{2}
here,
u=0 and a=1.25 m per sec square
So, at the end of 8 seconds,
S= 40 metres
So, now a stone is released from initial velocity zero
again we use the same equation, where we know that s= 40 m
now the acceleration will be due to gravity we take it as a= 10 m per sec square
and u= 0
So, we get t= 2.83 seconds approximatly.

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