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Question

A rocket is launched to travel vertically upward with a constant velocity of 20 m/s. After travelling 35 s the rocket develops a snag and its fuel supply is cut off. The rocket then travels like a free body, the height achieved it is

A
600 m
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B
720 m
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C
800 m
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D
820 m
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Solution

The correct option is B 720 m
For upward motion of rocket with uniform velocity u=20ms1;t=35s;
h=ut=20×35=700m
For upward motion after fuel cut off u=20ms1;v=0;g=10ms2
using formula v=u+gt
0=2010×t
t=2s
from formula v2=u2+2gh
putting values,we get,
0=2022×10×h
0=40020h
h=40020=20m
Total height achieved =700+20=720m
hence,option b is correct.

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