A bullet is fired horizontally at from a rifle that is free to slide without friction…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A 0.020 kg0.020\,\text{kg} bullet is fired horizontally at 400 m s−1400\,\text{m}\,\text{s}^{-1} from a 2.0 kg2.0\,\text{kg} rifle that is free to slide without friction on a horizontal surface. What is the speed of the rifle immediately after the bullet leaves the barrel? (a) 8 m s−18\,\text{m}\,\text{s}^{-1} opposite the bullet’s motion (b) 4 m s−14\,\text{m}\,\text{s}^{-1} in the same direction as the bullet (c) 40 m s−140\,\text{m}\,\text{s}^{-1} opposite the bullet’s motion (d) 4 m s−14\,\text{m}\,\text{s}^{-1} opposite the bullet’s motion

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