Question

A car travelling at 18 km per hour speed up to 54 km per hour in 5 second what is its
acceleration

Answer 1

Answer:

2 m/s^2

Explanation:

According to the given question,

u = initial velocity = 18 km/h = 18 ×1000/ 3600 = 5 m/s

v = final velocity = 54 km/h = 54 × 1000/3600 = 15 m/s

t = time = 5 sec

a = acceleration

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

We know,

• v = u + at

Putting the values we get,

• 15 = 5 + 5a

• 5a = 15-5

• 5a = 10

• a = 10/5

• a = 2 m/s^2

Thus acceleration of the car is 2 m/s^2.

Answer 2

Answer:2m/s²

Explanation:

u=18km/h

V=54km/h

Time=5 sec

Converting km/h in m/s

U=18km/h

Multiply by 5/18 to convert in m/s

18×5/18=5m/s

V=54km/h

54×5/18=15m/s

Now,

U=5m/s,v=15m/s, time=5sec

So,

A=v-u/t=15-5/5

10/5=2m/s²