A) 15 Ns
B) 25 Ns
C) 30 Ns
D) 10 Ns
Correct Answer: A
Solution :
During collision of ball with the wall horizontal momentum changes (vertical momentum remains constant) \[\therefore \] \[F=\frac{change\text{ }in\text{ }horizontal\text{ }momentum}{time\text{ }of\text{ }contact}\] \[=\frac{m(v+u)\cos \theta }{t}\] \[=0.5(20+10)\cos \theta =15Ns\]You need to login to perform this action.
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