A car starts from rest, accelerates uniformly for $5\ \text{s}$ reaching a speed of $20\ \text{m s}^{-1}$. It then travels at this constant speed for $30\ \text{s}$ and finally decelerates uniformly to rest in $4\ \text{s}$.

Calculate:
1. The total distance travelled by the car during the whole motion.
2. The average speed of the car over the entire journey.

Question

A car starts from rest, accelerates uniformly for $5\ \text{s}$ reaching a speed of $20\ \text{m s}^{-1}$. It then travels at this constant speed for $30\ \text{s}$ and finally decelerates uniformly to rest in $4\ \text{s}$.

Calculate:
1. The total distance travelled by the car during the whole motion.
2. The average speed of the car over the entire journey.

Accepted Answer

Total distance = 690 m, average speed = 17.7 m s⁻¹

Neco Model Questions Vol1 2023 Physics Question 19

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