A car weighing 1000 kg has a velocity of 50 kmph. If a mass of 250 kg is placed on it. What will be the velocity?
Correct answer: A. 40 kmph
- A. 40 kmph
- B. 50 kmph
- C. 35 kmph
- D. 250 kmph
Explanation
Data: The weight of the car initially = m1 = 1000 kg Initial velocity of the car = v1 = 50 km/h The weight after placing the mass on it = m2 = 1000 + 250 kg Final velocity of the car = v2 = ? Using the law of conservation of momentum: Initial momentum = Final momentum m1 v1 = m2 v2 1000 kg x 50 km/h = 1250 kg x v2 50,000 kg km/h / 1250 kg = v2 5000 / 125 = 200 / 5 = 40 km/h = v2
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