A hot air balloon starts rising from ground with an acceleration 1.25m/second square. After 8 sec, a stone is dropped from the balloon. The balloon will- 
A)cover a distance of 40m before hitting the ground 
B) have a displacement pf 50m on hitting the ground
C)reach the ground in 4 seconds  

Asked by adityaahuja099 | 11th Oct, 2017, 06:08: PM

Expert Answer:

Below are the steps to the solution.
- Use formula 
u=0 and substitute given value for acceleration and time.
- Find 'v'
-Find 's' using 
v2  = u2  + 2as
- Using 's' and taking 'v' as 'u' and assuming a= 10 m/s2 
in the formula
s=ut+ 1/2 at2  
you will get the answer as t=4 seconds.  

Answered by Abhijeet Mishra | 11th Oct, 2017, 07:31: PM

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