A car moves with an average speed of 45 miles/hour. How long does the car take to travel 90 m

A. 2 minutes

B.

2 hours

C. 45 minutes

D. 45 hours

E

90 minutes

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A proton of mass m moving with a speed of 3.0 * 106 m/s undergoes a head on elastic collision with an alpha particle of mass 4m at rest. What are the velocities of the two particles after the collision?

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