1. The ratio of maximum acceleration to maximum velocity in SHM is 10s initial phase is, the maximum acceleration is At, t=0 the displacement is 5m. If the (A) 500ms (B) 500/2ms (C) 750ms (D) 7502ms 2. Two stones are projected with the same speed but making different angles with the horizontal. Their horizontal ranges are equal. The angle of projection of one is and the maximum height reached by it is 102 m. Then the maximum height reached by the other in metres is (A) 138 (B) 84 (C) 56 (D) 34 3. A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10m/s. A plumb bob is suspended from the roof of the car by a light rigid rod of length 1m. The angle made by the rod with the vertical is (g=10ms) (A) zero (B) 30 (C) 45 (D) 60 4. A simple pendulum has a string of length / and bob of mass m. When the bob is at its lowest position, it is given the minimum horizontal speed necessary for it to move in a circular path about the point of suspension. The tension in the string at the lowest position of the bob is 5. (A) 3mg (B) 4mg (C) 5mg (D) 6mg A stone is projected vertically up to reach a maximum height 'h'. The ratio of its kinetic to potential energies at a height 3h 5 (A) 5:3 will be (B) 2:5 (C) 2:3 (D) 3:5