Question

A car travel at a uniform velocity of 20m|s for 5s. The breaks are applied and the car comes to rest with uniform retardation in a further 8s. Draw a velocity diagram. How far does the car travel after the breaks are applied?

Answer 1

Answer on Question #67430- Physics / Other

A car travel at a uniform velocity of $20\mathrm{m/s}$ for 5s. The breaks are applied and the car comes to rest with uniform retardation in a further 8s. Draw a velocity diagram. How far does the car travel after the breaks are applied?

Solution:

The velocity diagram

The area under the line in a velocity-time graph represents the distance travelled after the breaks are applied.

So, distance

$$s = \frac {1}{2} \times 20 \times 8 = 80 \mathrm {m}.$$

Answer: $s = 80 \mathrm{~m}$.

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