Question

6. A truck running at 90 km/h, slows down to 54 km/h
over a distance of 20 m. Calculate a. the retardation
produced by its brakes and b. the time in which the
truck slows down.​

Answer 1

Answer:

90*5/18=25m0s

54*5/18=15m/s

v^2-u^2 =2as

15^2-25^=2*a*20

225-625=2a*20

2a=400/20

2a=20

a=20/2

a=10m/s^2

v=u+at

15=25-10t

10t=25-15

t=10/10

t=1s

Explanation:

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