Question

A 100Kg vehicle moving with a speed of 20m/s is brought to rest in a distance of 50m. Find acceleration, calculate unbalanced force acting on vehicle.

Answer 1

Data:  mass of the body = 1,000 kg
          Initial velocity (u) = 20 m/s
          Final velocity (v) = 0 m/s
           Displacement (S) = 50 m
              Force acting (F) =?
Solution: 

We know that F = ma and      2as=  v2 - u2  ⇒ 2 × a × 50 m = 02 - 202a= -4 m/s2 now F = ma ⇒F = 1,000 × -4 = -4,0000NNote:  Negative symbol represents The opposit direction to the displacement.

Answer 2

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