An object moves with a constant acceleration of 3 m/s². If it starts from rest,

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Question: An object moves with a constant acceleration of 3 m/s². If it starts from rest, what is its velocity after 4 seconds?

Options:

Correct Answer: 12 m/s

Solution:

Using the formula v = u + at, where u = 0, a = 3 m/s², and t = 4 s, we get v = 0 + 3 * 4 = 12 m/s.

An object moves with a constant acceleration of 3 m/s². If it starts from rest, what is its velocity after 4 seconds?

An object moves with a constant acceleration of 3 m/s². If it starts from rest, what is its velocity after 4 seconds?

Step 1: Identify the initial velocity (u). Since the object starts from rest, u = 0 m/s.
Step 2: Identify the acceleration (a). The problem states that the acceleration is 3 m/s².
Step 3: Identify the time (t). The problem states that the time is 4 seconds.
Step 4: Use the formula for final velocity (v), which is v = u + at.
Step 5: Substitute the values into the formula: v = 0 + (3 m/s² * 4 s).
Step 6: Calculate the result: v = 0 + 12 m/s = 12 m/s.
Step 7: Conclude that the velocity after 4 seconds is 12 m/s.

Kinematics – The study of motion, specifically how objects move under constant acceleration.
Equations of Motion – Using the formula v = u + at to calculate final velocity based on initial velocity, acceleration, and time.