if a car starts from rest and reaches 20 m/s velocity in 10 s then acceleration is:
Correct answer: D. 2 m/s²
- A. 20 m/s²
- B. 10 m/s²
- C. 5 m/s²
- D. 2 m/s²
Explanation
The formula for uniformly accelerated motion is v = u + at. Here, the car starts from rest, so the initial velocity u = 0. The final velocity v = 20 m/s, and the time t = 10 s. Substituting these values into the formula gives 20 m/s = 0 + a(10 s), which simplifies to a = 20 m/s / 10 s = 2 m/s². Therefore, the correct answer is 2 m/s².Option A suggests an acceleration of 20 m/s², which would be correct if the velocity was reached in 1 second, not 10 seconds. Option B's 10 m/s² would suggest a much faster increase in velocity than given. Option C's 5 m/s² would imply a miscalculation of either time or velocity change.
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