Question

a car increases it's speed from 20km/h to 30km/h in 10 seconds. it's acceleration is ​?

A) 30m/s^2

B) 3m/s^2

C) 18m/s^2

D) 0.83m/s^2
​

Answer 1

Hi mate...

Greetings to u !!

Here is ur answer:

→ Final velocity (v) = 30km/h

$30km/h\\\\\frac{30*1000}{60*60}\\\\30*\frac{5}{18}\\\\\frac{25}{3} m/s$

→ Initial velocity (u) = 20km/h

$20km/hr=\\\\\frac{20*1000}{60*60}\\\\20*\frac{5}{18}\\\\\frac{50}{9}m/s$

→ Time taken (t) = 10 sec

→ Acceleration (a) =

$\frac{v-u}{t} \\\\\frac{\frac{25}{3}-\frac{50}{9} }{10}\\\\\frac{\frac{75-50}{9} }{10}\\\\\frac{75-50}{9*10}\\\\\frac{25}{90}= 0.277m/s$

∴ Acceleration is 0.277m/s (approx.)

Answer 2

@Surbhi000 is right....

u can surely agree with her answers

mark the above as brainliest