What is the momentum of an object of mass 300 g moving with a velocity of 18 km/h ? (1) 5 kg m/s 1.5 kg m/s 2.5 kg m/s 0.5 kg m/s.
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Provided that:
- Mass = 300 g
- Velocity = 18 kmph
To determine:
- Momentum
Solution:
- Momentum = 1.5 kg m/s
Knowledge required:
- SI unit of momentum = kg m/s
- SI unit of velocity = m/s
- SI unit of mass = kg
Using concepts:
- Momentum formula
- Formula to convert kmph-mps
- Formula to convert g-kg
Using formulas:
- p = mv
- 1 kmph = 5/18 mps
- 1 g = 1/1000 kg
Where, p denotes momentum, m denotes mass and v denotes velocity.
Required solution:
~ Firstly let us convert kmph-mps!
→ 18 kmph = 18 × 5/18 mps
→ 18 kmph = 1 × 5/1 mps
→ 18 kmph = 5 mps
- Henceforth, converted!
~ Now let us convert g-kg!
→ 1 g = 1/1000 kg
→ 300 g = 300/1000 kg
→ 300 g = 3/10 kg
→ 300 g = 0.3 kg
- Henceforth, converted!
~ Now let us find out the momentum!
→ p = mv
→ p = 0.3 × 5
→ p = 1.5 kg m/s
→ Momentum = 1.5 kg m/s
- Henceforth, solved!
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