a car starts from rest and move at a speed of 30 kph after half an hour.what is the car's acceleration
the cars acceleration is zero
That's 60 km/hr^2
60
not 0
Other
To find the car's acceleration, we need to use the formula for acceleration, which is:
Acceleration (a) = Change in velocity (Δv) / Time taken (Δt)
Here, the change in velocity (Δv) is the difference between the final velocity and initial velocity (v_f - v_i). The initial velocity (v_i) is the speed at which the car starts, which is zero since it starts from rest. The final velocity (v_f) is 30 kph.
The time taken (Δt) to reach this speed is given as half an hour, which we need to convert into hours. Since there are 60 minutes in an hour, half an hour is 0.5 hours.
Now we can substitute these values into the formula:
Acceleration (a) = (30 kph - 0 kph) / 0.5 hours
To simplify the calculation, we need to convert kph to m/s since the standard unit of acceleration is meters per second squared (m/s^2).
1 kph = 0.27778 m/s (approximately)
Acceleration (a) = (30 * 0.27778 m/s - 0 m/s) / 0.5 hours
Acceleration (a) = (8.3334 m/s - 0 m/s) / 0.5 hours
Acceleration (a) = 8.3334 m/s / 0.5 hours
Acceleration (a) = 16.6667 m/s^2
Therefore, the car's acceleration is approximately 16.6667 m/s^2.