Question

A truck runing at 90 km/h slows down 54 km/h over a distance 20 m. Calculate a- the ratardation produce by breaks and b-day the time in which the truck slow down.

Answer 1

Answer:

Explanation;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

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