42. A 500 kg car takes around turn of radius 50 m  with a speed of 36 km/hr. The centripetal force  acting on the car will be :
(1) 1200 N
(2) 1000 N
(3) 750 N
(4) 250 N

43. In a circus, stuntman rides a motorbike in a circular track of radius R in the vertical plane. The minimum speed at highest point of track will be: (1) 2gR (2) 2gR (3) 3gR (4) gR 44. As per given figure to complete the circular loop what can be the maximum radius if initial height is 5m:- h=5m (1) 4 m (2) 2.5 m (3) 3 m (4) 2 m