| A particle of mass m collides elastically with a rigid wall as shown below. |
 |
| If duration of collision is\[\Delta t\], then torque provided by the wall about origin is |
A) 0
B) \[\frac{mva}{\Delta t}\]
C) \[\frac{2mva}{\Delta t}\]
D) \[\frac{2mvb}{\Delta t}\]
Correct Answer: C
Solution :
Applied torque, \[\tau \]= rate of change of angular momentum \[=\frac{\Delta L}{\Delta t}=\frac{2m\upsilon a}{\Delta t}\]
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