A particle is placed at the point A of a frictionless track ABC as shown in figure. It is gently pushed toward right. The speed of the particle when it reaches the point B is :
Select the correct option:
A
20m/s
B
√10 m/s
C
2√10 m/s
D
10 m/s
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
By COME
$$
\begin{aligned}
& \mathrm{KE}_{\mathrm{A}}+\mathrm{U}_{\mathrm{A}}=\mathrm{KE}_{\mathrm{B}}+\mathrm{U}_{\mathrm{B}} \\
& 0+\mathrm{mg}(1)=\frac{1}{2} \mathrm{mv}^2+\mathrm{mg} \times 0.5 \\
& v=\sqrt{g}=\sqrt{10} \mathrm{~m} / \mathrm{s}
\end{aligned}
$$
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