Center of MassHard
Question
A particle of mass m moves with velocity v0 = 20 m/sec towards a large wall that is moving with velocity v = 5 m/sec. towards a particle as shown . If the particle collides with the wall elastically, the speed of the particle just after the collision is :
Options
A.30 m/s
B.20 m/s
C.25 m/s
D.22 m/s
Solution
V2 = Z0
Vel. of Sep = Vel of approach (∴ elastic)
∴ 20 + 5 = V − 5
⇒ V = 30 m/s Ans.
vb = − (v0 + 2v) ∴ m1 > > m2
vb = − (20 + 10) = −30 m/sec.
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