Question

A car moving with an initial velocity of 25 m/s is brought to rest in 20 seconds. Calculate the acceleration.

Answer 1

Step 1: Given data

Initial velocity, u = 25 m/s,

Final velocity, v = 0 m/s,

Time, t = 20 s, and

To find, Acceleration, a

Step 2: Formula used

$\mathrm{a}=\frac{\mathrm{v}-\mathrm{u}}{\mathrm{t}}$ ,

$\mathrm{a}=\frac{0\mathrm{m}/\mathrm{s}-25\mathrm{m}/\mathrm{s}}{20\mathrm{s}}$ ,

$\mathrm{a}=-1.25\mathrm{m}/{\mathrm{s}}^2$

Step 3: Final answer

The acceleration of car is -1.25 m/s².