mum Block A has ma'ss 0.4 kg and is at rest on an inclined plane of slope angle 30 degrees. It is attached by means of a massless chord passing over a massless, frictionless pulley to block B, which'hangs freely. Assume that the inclined plane is frictionless. The system is initially in static equilibrium. 1. If the system is in static equilibrium, the mass of block B must be closest to (A) 0.20 kg (13) 0.35 kg (C) 0.46 kg (D) 0.80 kg (E) 2.00 kg If the chord is cut, what will the acceleration of block A become? (A) 0 (B) 4.9 m/s' (C) 8.5 m/s' (D) 9.8 mfs' (E) 11 III/S: 3. A ball of mass In is thrown vertically upward with an initial speed of v, as shown below. It reaches a maximum altitude of ii. If some air resistance is present, the amount of workthis air resistance does on the ballas it is rises to altitude b may be expressed as .1 | (A) mgh (B) mg(h-V) . (C) rngh+0.5mv2 (D) 0.5mv1mgh (E) 0.5mv2 As shown below, an object of mass m moves at initial speed v on a horizontal plane. Friction brings it to rest over a distance x. The average force of friction on the object while it is slowing down is (A) 11% (B) *9; (C) 49-5me a- . (E) Tf