The force-time (F-t) graph of a 10\text{ kg} moving object is shown below : What is the final speed of the object?
- A. 0
- B. 15\text{ m/s}
- C. 30\text{ m/s}
- D. 40\text{ m/s} ✓
Correct Answer: D. 40\text{ m/s}
Explanation
The area under the force-time graph represents the impulse or change in momentum. The total area is 50 + 300 + 50 = 400\text{ N}\cdot\text{s}. Given m = 10\text{ kg}, the change in velocity is 400 / 10 = 40\text{ m/s}.
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