An object of mass 10 ,kg is projected from ground with speed 40 ,… - Vidyadip

MCQ

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 $g=9.8 \,m / s ^2$ ]

A
$73$
✓
$98$
C
$176$
D
$140$

✓

Answer

Correct option: B.

$98$

b
(b) 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.

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