Question

In a 100-metre race, Ram ran with a constant acceleration of $0.5m{s}^{-2}$ from start to finish. What was his speed when he was just about to finish the race?

• A. 10 m/s
• B. 20 m/s
• C. 30 m/s
• D. 40 m/s

Answer 1

The correct option is A 10 m/s

Given:
$u=0m/s,s=100m,a=0.5m{s}^{-2},v=?$
Using the third equation of motion,
$v^2-u^2=2as$
$v^2-0^2=2\times 0.5\times 100$
$v=10m/s$