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4-1.Newton's Laws of Motion
hard
Two blocks of same mass $(4\ kg)$ are placed according to diagram. Initial velocities of bodies are $4\ m/s$ and $2\ m/s$ and the string is taut. Find the impulse on $4\ kg$ when the string again becomes taut .......... $N-s$
A$24$
B$6$
C$4$
D$2$
Solution
$s=4 t=2 t+5 t^{2}$
$5 t^{2}=2 t$
$t=0.4$
$\mathrm{v}=2+\mathrm{gt}=6 \mathrm{m} / \mathrm{s}$
$\mathrm{J}=\mathrm{mv}-\mathrm{mv}_{1}$
$-\mathrm{J}=\mathrm{mv}-\mathrm{mv}_{2}$
$v=5$
$\mathrm{J}=4(\mathrm{v}-4)$
$5 t^{2}=2 t$
$t=0.4$
$\mathrm{v}=2+\mathrm{gt}=6 \mathrm{m} / \mathrm{s}$
$\mathrm{J}=\mathrm{mv}-\mathrm{mv}_{1}$
$-\mathrm{J}=\mathrm{mv}-\mathrm{mv}_{2}$
$v=5$
$\mathrm{J}=4(\mathrm{v}-4)$
Standard 11
Physics
