A block is pulled along a horizontal surface by a force making an angle of above the…

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

Problem

5\,\text{kg}

block is pulled along a horizontal surface by a

50\,\text{N}

force making an angle of

20^{\circ}

above the horizontal. The coefficients of friction are

\mu_s = 0.40

and

\mu_k = 0.30

. Once the block starts moving, its acceleration is (a)

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

(b)

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

(c)

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

(d)

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