Question

A car travelling at 40 km/h speeds upto 50 km/h in 4 seconds . Calculate the acceleration of the car .

Can anyone plz answer this question​

Answer 1

Given :

• Initial velocity, u = 40 km/h

$40 \times \frac{5}{10} = \frac{100}{9}$

• Final velocity, v = 50 km/h

$50 \times \frac{5}{18} = \frac{125}{9}$

• Time, t = 4 sec

To find :

• Acceleration of the car

Solution :

$acceleration = \frac{v - u}{t} \\ \\ a = \frac{( \frac{125}{9} - \frac{100}{3}) }{4} \\ \\ a = \frac{( \frac{25}{9} )}{4} \\ \\ a = \frac{25}{9} \times 4$

a = 0.69 m/s²

Answer 2

Given :-

• initial velocity, u = 40 km/h

$40 \times \frac{5}{100} = \frac{100}{9}$

• Final velocity, v = 50 km/h

$50 \times \frac{15}{18} = \frac{125}{9}$

• Time, t = 4 sec

To Find :-

• Acceleration of car

Solution :-

$Acceleration = \frac{v - u }{ t}$

$a = \frac{ \frac{125}{9} \times \frac{100}{9} }{4}$

$= \frac{ \frac{25}{9} }{4}$

$= \frac{25}{9} \times 4$

$= \frac{25}{36}$

$a = 0.69 \: m/ {s}^{2}$