Question

A car is travelling at 20 km/h, it speeds upto 60 km/h in 6 seconds. What is its acceleration

Answer 1

Given Initial Velocity u = 20km/hr

                                       =20*5/18

                                       =50/9 m/s

Given speed = 60km/hr

                       = 60 * 5/18

                      = 150/9 m/s
 
  t = 6sec


We know that v=u+at i.e a = v-u/t
               
                                           = (150/9-50/9)/6

                                            = 100/54×18/5km/h

                                           =   6.67km/h


Hope this helps!

Answer 2

Answer:

1.85 m/s^2

Explanation:

According to the given question,

u = initial velocity = 20 km/h = 20×1000/3600 = 5.55 m/s

v = final velocity = 60 km/h = 60×1000/3600 = 16.67 m/s

t = time = 6 sec

a = acceleration

And we are asked to find the acceleration of the car.

We know,

v = u+at

Putting the values we get,

16.67 = 5.55+6a

6a = 16.67-5.55

6a = 11.11

a = 11.11/6

a = 1.85 m/s^2

Thus acceleration of the body is 1.85 m/s^2 from the given data of u, v and t.

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