A ball of mass m is dropped onto a smooth fixed wedge of inclination θ . The collision is perfectly elastic. If after the collision, the x component of the velocity of the block is 2 gh , then θ is

Question

A ball of mass m is dropped onto a smooth fixed wedge of inclination θ . The collision is perfectly elastic. If after the collision, the x component of the velocity of the block is 2 gh , then θ is, 30 °, 45 °, 60 °, 15 °

MARKS App · Accepted Answer

u → = - 2 gh j ^ v → = u → ⇒ v → = 2 gh i ^ ⇒ ucos ⁡ θ = vsin ⁡ θ tan ⁡ θ = 1 ⇒ θ = 45 o

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