Question

12. A toy car initially moving with a uniform velocity of
18 km h-1 comes to a stop in 2 s. Find the retardation of the car is S .I .unit
​

Answer 1

then the retardation of the car is S I unit

meter.

because we know,.

Velocity = distance / Time

and , from above ,

v= 18Km/h = 18×10∅∅/6∅×6∅

v=180/36=5m/s

and t= 2sec .

then the distance traveled by toy car is

d= v×t=5m/s ×2 s = 10m

then the retardation of the car is S .I .unit

metre

Answer 2

Answer:

Explanation: initial velocity= 18km/h (15m/s)

time=2sec

a=?

final velocity=?

solution: retardation=vf-vi/t

so,

=(0-15)/2

=-5/2

=-2.5m/s2

since retardation is negative because it is acting in opposite direction