Question

A toy car initially moving with uniform velocity of 18 km/h comes to stop in 2 s.Find the retardation of the car in S.I.units

Answer 1

Answer:Velocity, v=  

60×60s

18×1000m

​  

=5m/s

Using formula v=u−at, where v=0 and u=5m/s

Therefore, retardation, a=  

t

u

​  

=  

2s

5m/s

​  

=2.5m/s  

2

Explanation:

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Answer 2

Velocity :-

v = 18 × 1000m / 60 × 60s

= 5m/s

Using formula :-

v = u - at ,

where :-

v = 0 and u = 5m/s

Therefore, retardation :-

a = u/t = 5m^s/ 2s = 2.5m/s^2

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