A rocket is fired vertically from the ground- It moves upwards with a constant acceleration of 10 m-s2- After 30 seconds the fuel is finished- After what time from the instant of firing the rocket will it attain the maximum height- g-10 m-s2-

The correct option is A 30 s at t=30 secs v=at= 10× 30=300m/s as the fuel is done only g acts on the rocketat height h, v=0 v=0=300 gt t ...

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Standard XII

Physics

General Gravity Problem

A rocket is f...

Question

A rocket is fired vertically from the ground. It moves upwards with a constant acceleration of $10 x m / s^{2}$ . After $30 x s e c o n d s$ the fuel is finished. After what time from the instant of firing the rocket will it attain the maximum height? $g = 10 x m / s^{2}$ :

30 s

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45 s

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60 s

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75 s

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Solution

The correct option is A $30 s$
at t=30 secs v=at= $10 \times 30 = 300 m / s$
as the fuel is done only g acts on the rocket
at height $h, v = 0$
$v = 0 = 300 - g t$
$t = 30 s e c s$
it will attain maximum height after a total time of 30 secs

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A rocket is fired vertically from the ground. It moves upwards with a constant acceleration of 10xm/s2. After 30xseconds the fuel is finished. After what time from the instant of firing the rocket will it attain the maximum height? g=10xm/s2:

The correct option is A 30 sat t=30 secs v=at=10×30=300m/sas the fuel is done only g acts on the rocketat height h,v=0v=0=300−gtt=30secsit will attain maximum height after a total time of 30 secs

A rocket is fired vertically from the ground. It moves upwards with a constant acceleration of $10 x m / s^{2}$ . After $30 x s e c o n d s$ the fuel is finished. After what time from the instant of firing the rocket will it attain the maximum height? $g = 10 x m / s^{2}$ :

The correct option is A $30 s$
at t=30 secs v=at= $10 \times 30 = 300 m / s$
as the fuel is done only g acts on the rocket
at height $h, v = 0$
$v = 0 = 300 - g t$
$t = 30 s e c s$
it will attain maximum height after a total time of 30 secs