A rocket lifts off from ground and accelerate upwards at 
after, lift off a piece breaks off from the bottom of rocket. After breaking off, how much time it takes approximately to reach the ground?
(Take 
)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Distance covered by rocket in 
,
Now using 
at where, 
is speed of rocket after time 20 s.
Now, after 
the piece of rocket breaks off, the time taken by the piece to reach on ground be t'. Speed of rocket after 
speed of broken part of rocket 
) i.e. 
Solving we get
Since, time cannot be negative, so 
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