Question

Calculate time taken by an object to step when it covers 100m, decelerating at 5m/s2.

Answer 1

Answer:

20 sec

Explanation:

deceleration =change in velocity/ time

5 = 100-0/t

t= 20 sec

Answer 2

v^2 = u^2 + 2as

0 = u^2 + 2 × (-5) × 100

u^2 - 1000 = 0

u^2 = 1000

u^2 = 10√10

v = u + at

0 = 10√10 - 5t

5t = 10√10

t = 2√10s