Laws of Motion

Related Questions

• A lift accelerated downward with acceleration 'a'. A man in the lift throws a ball upward with acceleration ${a_0}({a_0} < a).$ Then acceleration of ball observed by observer, which is on earth, is

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• A man weighs $80kg.$ He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of $5m/{s^2}.$ What would be the reading on the scale. $(g = 10m/{s^2})$

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• A man measures time period of a pendulum $(T)$ in stationary lift. If the lift moves upward with acceleration $\frac{g}{4},$ then new time period will be

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• A body of mass 2 kg moving on a horizontal surface with an initial velocity of 4 m/sec comes to rest after 2 sec. If one wants to keep this body moving on the same surface with a velocity of 4 m/sec, the force required is

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• A 5000 kg rocket is set for vertical firing. The exhaust speed is $800\,m{s^{ - 1}}$. To give an initial upward acceleration of $20\,m{s^{ - 2}}$, the amount of gas ejected per second to supply the needed thrust will be $(g = 10\,m{s^{ - 2}})$

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