It takes a 900. kg racing car 12.3 s to travel at a uniform speed around a circular racetrack of radius 90.0 m. What is the centripetal force acting on the car, and which force provides it? Hint: calculate circumference to calculate velocity, then calculate acceleration, then use f=ma Group of answer choices A. 32659 B. 15236 N C. 21160 N

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A: You have told me to solve question no 5 only.

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A: Given  Mass of child m=40kg Radius of wheel r=9m Speed ω=4×2π60=0.42 rad/s

Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!