Question

A car travelling at 20km/h speeds up to 56 km/h in 5 seconds. What is its acceleration?​

Answer 1

Hey mate I did all the calculations. .. hope it helps ✌

Answer 2

Given :

Initial velocity,u = 20 km/h

= 20 × 1000 m / 60 × 60 s

= 20000/3600 = 200/36

= 5.55 m/s

Final velocity,v = 56 km/h

= 56 × 1000 m / 60 × 60 s

= 56000/3600 = 560/36

= 15.55 m/s

Time taken,t = 5 seconds

To find

The acceleration of a car

${\purple{\boxed{\large{\bold{Formula's}}}}}$

Kinematic equations for uniformly accelerated motion .

$\bf\:v=u+at$

$\bf\:s=ut+\frac{1}{2}at{}^{2}$

$\bf\:v{}^{2}=u{}^{2}+2as$

and $\bf\:s_{nth}=u+\frac{a}{2}(2n-1)$

${\underline{\sf{Answer}}}$

We have to find the acceleration of the car

From the first equation of motion,we have

v = u + at

15.55 = 5.55 + a × 5

5a = 15.55 - 5.55

5a = 10

a = 2 m/s²

Therefore, the acceleration of car is 2m /s²