A Car Heading North Suddenly Collides at an Intersection with a Truck

question 4

Multiple Choice

A car heading north suddenly collides at an intersection with a truck of the same mass heading east. If they lock together and travel at $28 \mathrm {~m} / \mathrm { s }$ at 15° north of east just after the collision, how fast was the car initially traveling?

• A)14 m/s
• B)7 m/s
• C)28 m/s
• D)11 m/s

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