Question
Physics Question on work, energy and power
Mass of body = 500 kg, μ= 0.7. Find work required to move a distance of 4 Km if the body moves with velocity 10 m/s.
A
3.5 × 106 J
B
28 × 106 J
C
7 × 106 J
D
14 × 106 J
Answer
14 × 106 J
Explanation
Solution
Since v = const. ⇒ F = μmg = 0.7 × 500 × 10 = 3500 N
W = FS = 3.5 × 103 × 4 × 103 = 14 × 106 J