A wrecking ball has a mass of 650 kg. it swings from a cable that is 21 m long. the centripetal force on the ball is 56 n. what is the tangential speed of the wrecking ball?

For an object in a circular motion, the force is obtained by the product of the mass, the angular speed and the distance of the object from the center of the motion. We calculate as follows:

F = mωr

56 = 650ω (21)

ω = 0.0410 rad / s

v = rω = 21 (0.0410) = 0.86 m/s

The correct answer was A "1.3 m/s"