Question

A block of mass 50 kg slides over a horizontal distance of 1 m. If the coefficient of friction between their surfaces is 0.2, then work done against friction is

• A. 98 J
• B. 72J
• C. 56 J
• D. 34 J

Answer 1

Answer: (A)

98 J

Answer 2

$W = \mu mgS = 0.2 \times 50 \times 9.8 \times 1 = 98\mspace{6mu} J$