Question

The speed of the block at point $C$ immediately before it leaves the second incline

• A. $\sqrt{120}m/s$
• B. $\sqrt{105}m/s$
• C. $\sqrt{90}m/s$
• D. $\sqrt{75}m/s$

Answer 1

The correct option is B $\sqrt{105}m/s$

$mg\left(3\right)=\frac{1}{2}(V_C^2-V_B^2)$

$\Rightarrow V_C=\sqrt{105}m/S$ .