A car accelerates from rest at a rate of 2 m/s². What is its speed after 5 secon

Practice Questions

Q1
A car accelerates from rest at a rate of 2 m/s². What is its speed after 5 seconds? (2023)
  1. 5 m/s
  2. 10 m/s
  3. 15 m/s
  4. 20 m/s

Questions & Step-by-Step Solutions

A car accelerates from rest at a rate of 2 m/s². What is its speed after 5 seconds? (2023)
  • Step 1: Identify the initial speed (u). Since the car starts from rest, u = 0 m/s.
  • Step 2: Identify the acceleration (a). The problem states that the car accelerates at a rate of 2 m/s², so a = 2 m/s².
  • Step 3: Identify the time (t). The problem states that the time is 5 seconds, so t = 5 s.
  • Step 4: Use the formula for final speed (v). The formula is v = u + at.
  • Step 5: Substitute the values into the formula: v = 0 + (2 m/s² * 5 s).
  • Step 6: Calculate the result: v = 0 + 10 m/s = 10 m/s.
  • Step 7: Conclude that the speed of the car after 5 seconds is 10 m/s.
  • Kinematics – The study of motion, specifically how objects move under the influence of forces, including concepts like acceleration, velocity, and time.
  • Equations of Motion – The use of mathematical formulas to relate displacement, velocity, acceleration, and time for objects in motion.
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