1. A block of mass m is stationary with respect to a rough wedge as shown in figure. Starting from rest, in time t work done on the block : (m = 1 kg, θ = 30°, a = 2 m/s2 t = 4s) Column I Column II (A) By gravity (p) 144 J (B) By normal reaction (q) 32 J (C) By friction (r) 56 J (D) By all the forces (s) 48 J (t) None
