A car accelerates from rest to a speed of 20 m/s in 5 seconds. What is its accel

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Question: A car accelerates from rest to a speed of 20 m/s in 5 seconds. What is its acceleration?

Options:

Correct Answer: 4 m/s²

Solution:

Acceleration is calculated using the formula a = (final velocity - initial velocity) / time. Here, a = (20 m/s - 0 m/s) / 5 s = 4 m/s².

A car accelerates from rest to a speed of 20 m/s in 5 seconds. What is its acceleration?

A car accelerates from rest to a speed of 20 m/s in 5 seconds. What is its 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 acceleration, which is 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 acceleration of the car is 4 m/s².

Acceleration – Acceleration is the rate of change of velocity over time, calculated as the difference between final and initial velocity divided by the time taken.
Kinematics – Kinematics involves the study of motion without considering the forces that cause it, focusing on parameters like velocity, acceleration, and time.