Question

A car of mass 1000kg moving at a speed of 80km per h-1 is brought to rest in 20s by a costant retarding force find the: (a) retardation and (b) retarding force exerted on the car.​

Answer 1

Answer:

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Answer 2

Answer:a)10/9 m/s²

b)10000/9N

Explanation:

Speed =80 km /h=(80×1000)/60×60 m/s

=200/9 m/s

Not final speed is zero so change in velocity=200/9 m/s

Time taken =20s so retardation=200/9×20=10/9m/s²

Regarding force = m×a

=10000/9N