Question

At a place where the acceleration due to gravity is $10m/se{c}^2$ a force of $5kg.wt$ acts on a body of mass $10kg$ initially at rest. The velocity of the body after $4$ second is:

• A. $5mse{c}^{-1}$
• B. $10mse{c}^{-1}$
• C. $20mse{c}^{-1}$
• D. $50mse{c}^{-1}$

Answer 1

The correct option is C $20mse{c}^{-1}$

$F=5kgwt=5\times 10=50N$
$\Rightarrow a=\frac{F}{m}=\frac{50}{10}=5m/s^2$
$V=at=5\times 4=20m/s$