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. Assume 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

The correct option is C

0.1 m/s

$v^2=2as=2\left(\frac{F}{m}\right)s[Asu=0]$
$\Rightarrow v^2=2\left(\frac{5\times {10}^4}{3\times {10}^7}\right)\times 3=\frac{1}{100}$
$\Rightarrow v=0.1m/s$