Question

A body, initially at rest, starts moving with a constant acceleration 2 m s^-2. Calculate: (i) the velocity acquired and (ii) the distance travelled in 5 s.

Answer 1

Initial velocity u = 0 m/s

Acceleration a = 2 m/s²

Time t = 5 s

(i) Let 'v' be the final velocity.

Then, (v - u)/5 = 2

v = 10 m/s^-1

 

(ii) Let 's' be the distance travelled.

Using the third equation of motion,

v² - u² = 2as

We get,

(10) ² - (0) ² = 2(2) (s)

Thus, s = (100/4) m = 25 m