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PART - 1 CH - 5Work, Energy and Power — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsPART - 1 CH - 5Work, Energy and Power2 Marks
Question
A car of mass 1000 kg moving with speed of $32 m / s$ collides with a truck of mass 8000 kg moving with velocity $4 m / s$ in the same direction. After the collision, the car returns in opposite direction with a velocity of $8 m / s$. Find the velocity of truck after the collision
✓

Answer

 Total momentum of car and truck
$\begin{array}{l}
=1000 \times 32+8000 \times 4 \\
=32000+32000 \\
=64000 kgm / s
\end{array}$
Total momentum of the car and truck after the collision will remain the same as it was before the collision. If the velocity of truck at the time of collision is $v$ then,
$\text { or } \begin{aligned}
8000 v+1000(-8) & =64000 \\
8000 v & =64000+8000 \\
8000 v & =72000 \\
\therefore \quad & v
\end{aligned}=\frac{72000}{8000}=9 m / s .$
Hence, the vleocity of the truck after the collision is
$9 m / s\quad \text { Ans. }$

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