Question

a car increases its speed from 20 kilometre per hour to 50 km per hour in 10 seconds what is the acceleration​

Answer 1

Here ,

Initial velocity of car = u = 20 km /h = 20×5/18 = 100/18 m/s

Final Velocity of car = v = 50 km/h = 50×5/18 = 250/18 m/s

Then , given time = 10 second

Acceleration = (Final Velocity- Initial Velocity)/Time

$( \frac{250}{18} - \frac{100}{18} ) \div 10 \\ \\ ( \frac{150}{18} ) \div 10 \\ \\ = \frac{150}{18 \times 10} = \frac{15}{18} = 0.833$

Hence the acceleration produced is 0.833 m/s²

Answer 2

Solution :

Given,

Initial Velocity, u = 20 km/h

Final Velocity, v = 50 km/h

Time taken, t = 10 s

Now, we have to convert 20 km/h into m/s by multipling with 5/18

20 × 5/18 = 100/18 = 50/9 m/s

Now, we have to convert 50 km/h into m/s by multipling with 5/18

50 × 5/18 = 250/18 = 125/9 m/s

For finding the acceleration of car,

For finding the acceleration of car,By using the formula of acceleration :

a = v - u / t

=> a = v - u / t

=> a = 125/9 - 50/9 / 10

=> a = 75/9 / 10

=> a = 75/9 × 1/10

=> a = 15/18

=> a = 0.833 m/s^2

.°. a = 0.833 m/s^2

Answer : Thus, acceleration of car is 0.833 m/s^2.