Question

A ship of mass $3\times 10^7\,kg$ initially at rest, is pulled by a force of $5\times 10^4 N$ through a distance of $3\, m$. Assuming that the resistance due to water is negligible, the speed of the ship is

• A. 1.5 m/s
• B. 60 m/s
• C. 0.1 m/s
• D. 5 m/s

Answer 1

Answer: (C)

$a=\frac{F}{m}=\frac{5\times 10^4}{3\times10^7}=\frac{5}{3}\times10^{-3} m/s^2$
$v=\sqrt{2as}$
$=\sqrt{2\times\frac{5}{3}\times10^{-3}\times3}$
$= 0.1\, m/s$