A bus moving on a straight road at a speed of 10 km/h increases its speed to 70 km/h in 2 minutes. Find its average acceleration.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 0.5 km/minute2.
The average acceleration of the bus is 0.5 km/min2.
Here's the calculation:
- Initial velocity (u): 10 km/h
- Final velocity (v): 70 km/h
- Time (t): 2 minutes
Formula for average acceleration:
- a = (v - u) / t
Substituting the given values:
- a = (70 km/h - 10 km/h) / (2 minutes)
- a = 60 km/h / (2 minutes)
- a = 30 km/h/min
Converting km/h to km/min:
- 1 hour = 60 minutes
- So, 30 km/h = 30 km/(60 minutes) = 0.5 km/min2
Therefore, the average acceleration of the bus is 0.5 km/min2.