The speed of a car moving in a straight line increases every second. It goes from 30 km/hr (about 19 mi/hr) to 35 km/hr (about 22 mi/hr) in the first second. The next second, it goes from 35 km/hr to 40 km/hr (about 24.8 mi/hr). What is its acceleration?
To find the acceleration of the car, we need to use the formula for acceleration:
Acceleration = (Final Velocity - Initial Velocity) / Time
In this case, the initial velocity is 30 km/hr, the final velocity is 40 km/hr, and the time is 1 second.
Acceleration = (40 km/hr - 30 km/hr) / 1 second
Acceleration = 10 km/hr / 1 second
To convert km/hr to m/s (meters per second), we divide by 3.6 because there are 3.6 seconds in an hour.
Acceleration = 10 km/hr / 1 second * (1 hr / 3600 seconds) * (1000 m / 1 km)
Acceleration = 10 * (1000 / 3600) m/s^2
Acceleration ≈ 2.78 m/s^2
Therefore, the acceleration of the car is approximately 2.78 m/s^2.