A car moving at 15 m/s comes to a stop in 5 seconds. What is its acceleration? (

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Question: A car moving at 15 m/s comes to a stop in 5 seconds. What is its acceleration? (2019)

Options:

Correct Answer: -2 m/s²

Exam Year: 2019

Solution:

Using the formula: acceleration = (final velocity - initial velocity) / time. Acceleration = (0 - 15) / 5 = -3 m/s².

A car moving at 15 m/s comes to a stop in 5 seconds. What is its acceleration? (2019)

A car moving at 15 m/s comes to a stop in 5 seconds. What is its acceleration? (2019)

Step 1: Identify the initial velocity of the car. The car is moving at 15 m/s, so initial velocity = 15 m/s.
Step 2: Identify the final velocity of the car. The car comes to a stop, so final velocity = 0 m/s.
Step 3: Identify the time it takes for the car to stop. The car stops in 5 seconds, so time = 5 seconds.
Step 4: Use the formula for acceleration: acceleration = (final velocity - initial velocity) / time.
Step 5: Plug in the values: acceleration = (0 m/s - 15 m/s) / 5 s.
Step 6: Calculate the result: acceleration = -15 m/s / 5 s = -3 m/s².
Step 7: Interpret the result. The negative sign indicates that the car is decelerating.

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 quantities like velocity, acceleration, and time.