Achild on a spinning playground ride is ( 36 m from the
center of the ride. the centripetal force on the child is 19 n.
what is the mass of the child if the child has a tangential
speed of 0.54 m/s?
3.7 kg
13 kg
23 kg
79 kg

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i just did this and got a 100.

we need to know the time interval during which the force acts. impulse of force = momentum change

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures