Verified Solution • 2025–26 Session moderate

QJEEAdv08Phab6e: JEE Advanced 2008 Physics - Class 11 JEEAdv08Phab6e Solution: The speed of the block at point B immediately after it strikes…

The speed of the block at point B immediately after it strikes the second incline is

Multiple Choice Options

  • A 60\sqrt{60} m/s
  • B 45\sqrt{45} m/s
  • C 30\sqrt{30} m/s
  • D 75\sqrt{75} m/s

Step-by-Step Verified Solution

Velocity along the plane just before collision,

v2−u2=2gs⇒v=2g×3=60 m/s{v^2} - {u^2} = 2gs \Rightarrow v = \sqrt {2g \times 3} = \sqrt {60} \,m/s

Velocity along the plane just after collision

vB−vcos⁡30=45 ms−1{v_B} - v\cos 30 = \sqrt {45} \,m{s^{ - 1}}

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