Question

A car increases its speed from 20km/h to 50 km/h in 10s. Its acceleration is :

A.30 m/s2
B.3 m/s2
C.18 m/s2
D.none of these

Answer 1

The acceleration of the car is 0.833 m/s².

Step-by-step explanation:

The acceleration of the car can be calculated using the formula:

acceleration = (change in velocity) / time

Given that the car increases its speed from 20 km/h to 50 km/h in 10s, the change in velocity is 50 km/h - 20 km/h = 30 km/h. Converting this to m/s by multiplying by (1000/3600), we get 30 km/h * (1000/3600) = 8.33 m/s. So, the acceleration is:

acceleration = 8.33 m/s / 10s = 0.833 m/s²

Therefore, the correct answer is A. 0.833 m/s².