If a car accelerates from rest to 20 m/s in 5 seconds, what is its average accel

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Question: If a car accelerates from rest to 20 m/s in 5 seconds, what is its average acceleration?

Options:

Correct Answer: 2 m/s²

Solution:

Average acceleration (a) = (final velocity - initial velocity) / time = (20 m/s - 0 m/s) / 5 s = 4 m/s².

If a car accelerates from rest to 20 m/s in 5 seconds, what is its average acceleration?

If a car accelerates from rest to 20 m/s in 5 seconds, what is its average acceleration?

Step 1: Identify the initial velocity of the car. Since the car starts from rest, the initial velocity is 0 m/s.
Step 2: Identify the final velocity of the car. The final velocity is given as 20 m/s.
Step 3: Identify the time taken for the acceleration. The time is given as 5 seconds.
Step 4: Use the formula for average acceleration, which is: average acceleration (a) = (final velocity - initial velocity) / time.
Step 5: Substitute the values into the formula: a = (20 m/s - 0 m/s) / 5 s.
Step 6: Calculate the difference in velocity: 20 m/s - 0 m/s = 20 m/s.
Step 7: Divide the difference in velocity by the time: 20 m/s / 5 s = 4 m/s².
Step 8: Conclude that the average acceleration of the car is 4 m/s².

Average Acceleration – Average acceleration is calculated by the change in velocity divided by the time taken for that change.
Kinematics – This question involves basic kinematic equations that relate velocity, acceleration, and time.