Question

A car is travelling at 18 m/s, it speeds up to 36 m/s in 5 seconds. What is its acceleration

Answer 1

Answer:

Initial speed = u = 18 km/hr = 5 m/s

Final sped = v= 36 km/hr = 10 m/s

acceleration a = (v-u)/t = (10-5)/5 = 1 m/s²

Distance travelled S = ut + (1/2) a t² = 5x5 +

(1/2)x1x5² = 37.5 m

Answer 2

Given,

A car is travelling at 18 m/s.

Speeds up to 36 m/s in 5 seconds.

To find,

The acceleration of the car.

Solution,

We can simply solve this numerical problem by using the following process.

Here,

Initial velocity (u) = 18 m/s

Final velocity (v) = 36 m/s

Time elapsed (t) = 5 seconds

Acceleration (a) = ?

According to the kinematics :

a = (v-u)/t

a = (36-18)/5 ms²

a = (18/5) ms²

a = 3.6 m/s²

(This will be considered as the final result. We have used the SI unit of acceleration, because all the other physical quantities are also in SI units.)

Hence, the acceleration will be 3.6 m/s²