UPSEE 2017 Solved Paper

Two particles P and Q are moving on a circle. At a certain instant of time both the particles are diametrically opposite and P has tangential acceleration 8m∕s2 and centripetal acceleration 5m∕s2 whereas Q has only centripetal acceleration of 1m∕s2. At that instant acceleration (in m∕s2 ) of P with respect to Q is