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Work, Energy, Power and Collision question bank (Physics)

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Q1.

$A$ particle of mass $m$ moving eastward with a speed $v$ collides with another particle of same mass moving northward with same speed $v$. The two particles coalesce after collision. The new particle of mass $2m$ will move in north-east direction with a speed (in $m/s$) of:

(A)

$v$

(B)

$2v$

(C)

$\frac{v}{2}$

(D)

$\frac{v}{\sqrt{2}}$

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Q2.

$A$ ball of mass $m$ is dropped from a height $s$ on a horizontal platform fixed at the top of a vertical spring. The platform is depressed by a distance $h$. The spring constant is ($g=$ acceleration due to gravity):

(A)

$\frac{2 mg(s-h)}{h^2}$

(B)

$\frac{2 mg(s+h)}{h^2}$

(C)

$\frac{mg(s-h)}{h}$

(D)

$\frac{mg(s+h)}{h}$

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