Question

a truck is travelling at 54km/h is slow down to 36km/h in 10 sec,find the retardation​

Answer 1

Answer:

9 km/h 2

Explanation:

Initial velocity (u) = 54 km/hr

Final velocity (v) = (54 - 36) km/hr

Time (t) = 4 seconds

We know v = u - at

⇒ 18 = 54 - a × 4

or 4a = 54 - 18

or a =

4

36

=9km/h

2

∴Retardation = 9 km/h

2

Answer 2

u  =54km/h = (54 × 5/18)m/s = 15m/s

v = 36km/h = (36 × 5/18)m/s = 10m/s

t=10sec

a=?

a = 10-15/10

a = -5/10

a = -0.5m/s²

acceleration = -0.5m/s²

it means retardation = 0.5 m/s²