A rocket is launched to travel vertically upward with a constant velocity of 20 m/s. After travelling for 35 seconds, the rocket develops a snag and its fuel supply is cut off. The rocket then travels like a free body. The height achieved by it is:
we know that
S = ut
This is because it is moving at a constant velocity.
After 35 seconds the distance will be :
S = 20 × 35 = 700m
Now from 700 m above the ground now it travels at a free fall.
The initial velocity = 20 m/s
Final velocity = 0
Acceleration due to gravity = 10
Now :
V² = U² - 2gs
0 = 400 - 20S
20s = 400
S = 400/20
S = 20 m
The total height achieved = 700 + 20
= 720 m
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