Question

A car starts from rest and accelerates uniformly at 3 m/s\textsuperscript{2. What will be its velocity after 5 seconds?}

• A. 10 m/s
• B. 15 m/s
• C. 20 m/s
• D. 30 m/s

Hint:

Use the equation \( v = u + at \) when acceleration is constant and you know the initial velocity and time.

Answer 1

The Correct Option is B

Given: Initial velocity \( u = 0 \, \text{m/s} \) (since the car starts from rest)
Acceleration \( a = 3 \, \text{m/s}^2 \)
Time \( t = 5 \, \text{s} \) We use the first equation of motion: \[ v = u + at \] Substituting the values: \[ v = 0 + (3)(5) = 15 \, \text{m/s} \] Option (b) is correct.