Question

. A rocket is projected vertically upward
from the ground with resultant acceleration
of 20 m/sec? in upward direction. After 10
seconds, engine of the rocket is switched
off and rocket falls under gravity.
Direction of the velocity changes after a
time of (N/10) sec. Then the value of N is​

Answer 1

Answer:

N's value is 10

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Answer 2

Answer:

then the value of N =20 sec

A rocket is projected vertically upward from the ground with resultant acceleration

Explanation:

a rocket is projected vertically upward from the ground with resultant acceleration of 20m/s

after 10 sec engine of the rocket is switched off and rocket falls under gravity.

so

V=u+at

V=0+20x10

V=200m/s

now a=g=10

so V=u+at

    0=200-10t

t=20 sec

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