A block rests on a horizontal surface with coefficient of kinetic friction

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

Problem

4\,\text{kg}

block rests on a horizontal surface with coefficient of kinetic friction

\mu_k = 0.25

. It is connected by a light string over a smooth pulley to a hanging block of mass

5\,\text{kg}

. When the system is released, what is the magnitude of the acceleration of the blocks? (Take

g = 10\,\text{m s}^{-2}

.) (a)

4.2\,\text{m s}^{-2}

(b)

4.4\,\text{m s}^{-2}

(c)

5.6\,\text{m s}^{-2}

(d)

3.1\,\text{m s}^{-2}