Question

A particle is moving from point A to point B and covers the entire distance of 10 km in just 2 minutes. What would be the speed at which the particle was traveling?

• A. $53.3m{s}^{-1}$
• B. $83.3m{s}^{-1}$
• C. $90.3m{s}^{-1}$
• D. $80.3m{s}^{-1}$

Answer 1

The correct option is B

$83.3m{s}^{-1}$

Given, distance covered $=10km=10\times 1000=10,000m$ .
Time taken $=2minutes=2\times 60=120s$
We know, $speed=\frac{distance}{time}=\frac{10,000}{120}=83.33m{s}^{-1}$
$\therefore$The speed at which the particle was travelling is $83.3m{s}^{-1}.$