Question

A body of mass $1kg$ is subjected to a force of $20N$ for $10$ seconds after which the force ceases to act. What distance would it travel in the next $10$ seconds? Assume that the body starts from rest.

• A. $20m$
• B. $200m$
• C. $2km$
• D. $20km$

Answer 1

The correct option is C $2km$

Let the distance covered in the first 10 seconds be AB and the distance covered in the next 10 seconds be BC.


For AB, $a=\frac{20}{1}=20m/s^2$
$V_B=0+at=20\times 10=200m/s$

For BC, $a=0$ as $F=0$
$\therefore BC=V_B.t=200\times 10$
$=2000m=2km$