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Q. An object of mass $10\, kg$ is projected from ground with speed $40\, m / s$ at an angle $60^{\circ}$ with horizontal. The rate of change of momentum of object one second after projection in $SI$ unit is [Take $g=9.8\, m / s ^{2}$ ]

Motion in a Plane

Solution:

Force $=\frac{\Delta p}{ \Delta t }$, force remains constant $=m g$
$\Rightarrow 10 \times 9.8$
$\Rightarrow 98\, N$
At $t=1$, particle is at its maximum height.