Two skaters P and Q are skating towards each other. Skater P throws a ball towards Q every 5 s such that it always leaves her hand with speed 2ms−1 with respect to the ground. Consider two cases:
(I) P runs with speed 1ms−1 towards Q while Q remains stationary.
(II) Q runs with speed 1ms−1 towards P while P remains stationary.
Note that irrespective of speed of P, ball always leaves P’s hand with speed 2ms−1 with respect to the ground. Ignore gravity. Balls will be received by Q

Question

Examsnet · Accepted Answer

Correct Answer is :  one every 2.5 s in case (I) and one  every 3.3 s in case (II)

KVPY SA Exam 2013 Question Paper