16. 17. In the given figure, the block of mass m is dropped from the point 'A'. The expression for kinetic energy of block when it reaches point 'B' is 1 (a) =mg y 1 (b) mg y (c) mg (y - Yo) (d) mg yo y Ground A Yo ->B A block of mass M placed inside a box descends vertically with acceleration 'a'. The block exerts a force equal to one-fourth of its weight on the floor of the box. The value of 'a' will be (a) g 4 (b) / 2 3g (c) 4 (d) g If the electric potential at any point (x, y, z)m in space is given by V = 3x volt. The electric field at the point (1, 0, 3)m will be: (a) 3 Vm, directed along positive x-axis. (b) 3 Vm, directed along negative x-axis. (d) 6 Vm, directed along negative x-axis. (c) 6 Vm, directed along positive x-axis. 19. The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of 202. The value of internal resistance of each cell is 20. (a) 202 (b) 4 (c) 602 () 8 w high above (c) 100m (d) 200m A person can throw a ball upto a maximum range of 100m. How high above the ground he can the same ball? (a) 25m (b) 50m