At an athletics competition, a hammer thrower swings a hammer in a horizontal circle.

Immediately before releasing the hammer, the ball at the end of the hammer is moving at a

constant angular velocity of 10rad/s in a horizontal circular path of radius 2.5m.

Which row in the table gives the speed and the magnitude of the acceleration of the ball just

before release?

row 4

row 2

row 3

row 1

row 5

acceleration = radius x (angular velocity)^2 = 10 x 10 x 2.5 = 250

speed = radius x angular velocity = 2.5 x 10 = 25

Therefore row 1 is correct, and the answer will be D

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