1 3 2F ELE m 3 Zero F 2m 0000000 m vovovor 4 Which among the following is correct for conservative forces Work done by a conservative force in a closed path is 1 Positive 2 Zero 3 Negative 4 All of these are possible 10 A spring of spring constant k is compressed by an amount of x and a mass m is just placed in contact with it and released Calculate minimum value of x for which the mass m completes the vertical circle in the circular track 1 2gR m m Natural length position F 2 smooth 5gR m k 2 3 5gR 4 None of these k Two blocks in contact with each other are being pushed by a external agent as shown 1 3 14 m F m m 3 m m m 12 A particle of mass m is moving in a circular path o fixed radius r such that its centripetal acceleration 1 Vo 3 a is varying with time as a k rt2 where ki constant The power delivered to the particle by th forces acting on it as a function of time t is 1 2 mk r t 2 mk r t mk4r215 Fv 1 Zero 2 Fv projection with speed resistance is 4 13 A body of mass 0 5 kg travels in a straight line w 3mv 4 1 velocity v ax3 2 where a 5 m 2 s The w done by the net force during its displacement fr x 0 to x 2 m is 2 50 J 1 1 5 J 3 10 J 4 100 J A body of mass m is projected vertically wi velocity vo If it passes through the poir m F m m 4 O Vo 1 2 the work done b 2 Foror 15 A massless spring when stretched by a force shows an extension of 1 5m This sp arranged as shown in figure A block of mas is released at rest on a frictionless incline down and compresses the spring by 3m coming to rest momentarily Distance by wi block slides before hitting the spring is 0 30 3mv 4 3mv 8 10Kg