MCQ
A body of mass $10\,kg$ moving with speed of $3 \,ms ^{-1}$ collides with another stationary body of mass $5 \,kg$. As a result, the two bodies stick together. The $KE$ of composite mass will be .......... $J$
- A$60$
- ✓$30$
- C$90$
- D$120$
Using momentum conservation
$10(3)=15 \,V$
$V=2 \,m / s$
$K . E .=\frac{1}{2} m v^2=\frac{1}{2}(15)(2)^2$
$=30 \,J$
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| LIST$-I$ | LIST$-II$ |
| $(A)$ Torque | $(I)$ $ML ^{-2} T ^{-2}$ |
| $(B)$ Stress | $(II)$ $ML ^2 T ^{-2}$ |
| $(C)$ Pressure of gradient | $(III)$ $ML ^{-1} T ^{-1}$ |
| $(D)$ Coefficient of viscosity | $(IV)$ $ML ^{-1} T ^{-2}$ |
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