- #1
Charles W
- 20
- 0
Homework Statement
A lorry of mass 20,000kg is traveling at 20.0 metres per second. A car of mass 900kg is traveling at 30.0 metres per second towards the lorry.
What is the magnitude of the total momentum?
1. 209 kNs
2. 373 kNs
3. 427 kNs
4. 1045 kNs
2. Homework Equations
Linear Momentum = Mass * Velocity
The Attempt at a Solution
I have tried to find the momentum of each object:
20, 000 * 20 = 40, 000 (for the lorry)
900 * 30 = 27, 000 (for the car)
UPDATE
Can't believe I made such a stupid mistake:
20, 000 * 20 = 400,000
Therefore: 400, 000 - 27, 000 = 373, 000 (Option 2)
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