Question

1. A car has a constant acceleration of 2m/s2. (a) How much time will it take for the car to increase its velocity from 0km/h to 36km/h? 3

Answer 1

Answer:

Acceleration is defined as rate of change of velocity per unit time.

$a = 2m/s^{2}$

$v_i = 0 km/h = 0m/s$

$v_f = 36 km/h = 36 \times 1000/3600 =10m/s$

Acceleration is given by following relation,

$a=\frac{v_f - v_i}{t}$

$\therefore t=\frac{v_f - v_i}{a}$

$\Rightarrow t=\frac{10m/s - 0m/s}{2m/s^{2}}$

$\Rightarrow t=5s$

Which is the answer.