$Assertion$ : A rocket moves forward by pushing the surrounding air backwards.
$Reason$ : It derives the necessary thrust to move forward according to Newton’s third law of motion
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
If the Assertion is correct but Reason is incorrect.
If both the Assertion and Reason are incorrect.
An object of mass $'m'$ is being moved with a constant velocity under the action of an applied force of $2\, {N}$ along a frictionless surface with following surface profile.
The correct applied force vs distance graph will be:
A machine gun fires a bullet of mass $65\,g$ with a velocity of $1300 \,m / s$. The man holding it can exert a maximum force of $169 \,N$ on the gun. The number of bullets he can fire per second will be ............
A body moves with velocity $v = ln x\ m/s$ where $x$ is its position. The net force acting on body is zero at
A force-time graph for a linear motion is shown in figure where the segments are circular. The linear momentum gained between zero and $8$ second is
A soldier with a machine gun, falling from an alrplane gets detached from his parachute. He is able to resist the downward acceleration, if he shoots $40$ bullets a second at the speed of $500 \,m / s$. If the weight of a bullet is $49 \,g$, the weight of the man .......... $ \,kg$ with the gun? Ignore resistance due to air and assume the acceleration due to gravity, $g=9.8 \,ms ^{-2}$.