A car attains 54km/hr in 20 seconds after it start from rest. Find the acceleration of car.
To find the acceleration of the car, we can use the formula:
Acceleration (a) = (Final Velocity - Initial Velocity) / Time
In this case, the initial velocity is 0 km/hr because the car starts from rest. The final velocity is 54 km/hr, and the time taken is 20 seconds.
Converting the velocities to m/s:
Initial Velocity = 0 km/hr = 0 m/s
Final Velocity = 54 km/hr = (54 * 1000) / 3600 = 15 m/s
Substituting these values into the formula:
Acceleration (a) = (15 - 0) / 20
Simplifying:
Acceleration (a) = 15 / 20
Acceleration (a) = 0.75 m/s^2
Therefore, the acceleration of the car is 0.75 m/s².