Question

Select One Option Correct from the following : A small block of mass M moves on a fric- tionless surface of an inclined plane, as shown in the figure. The angle of the incline suddenly change from $60^{o}$ to $30^{o}$ at point B. The block is initially at rest at A. Assume that collisions between the block and the incline are totally in- elastic. [Take $g = 10 m/s^{2}$.The speed of the block at point C, immediately before it leaves the secon√d incline is
(A)$\sqrt{120} m/s$
(B)$\sqrt{105} m/s$
(C)$\sqrt{90} m/s$
(D)$\sqrt{75} m/s$

Answer 1

a option is correct.
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Answer 2

Select One Option Correct from the following : A small block of mass M moves on a fric- tionless surface of an inclined plane, as shown in the figure. The angle of the incline suddenly change from $60^{o}$ to $30^{o}$ at point B. The block is initially at rest at A. Assume that collisions between the block and the incline are totally in- elastic. [Take $g = 10 m/s^{2}$.The speed of the block at point C, immediately before it leaves the secon√d incline is

✔️(A)$\sqrt{120} m/s$

(B)$\sqrt{105} m/s$

(C)$\sqrt{90} m/s$

(D)$\sqrt{75} m/s$