When the sum of the external forces and the sum of the external torques on a body are both zero, we can conclude that

a. the body is moving at constant velocity but is not rotating.
b. the body is rotating at constant angular velocity but has no linear velocity.
c. the body has neither linear nor angular velocity.
d. the body may have constant linear or angular velocity, but not both simultaneously.
e. the body may have constant linear or constant angular velocity, or both simultaneously.


e

Physics & Space Science

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Mort, who is standing on the ground, throws a ball at 20 m/s westward as measured by him. What is the ball's velocity relative to Velma, who is in a train moving eastward past Mort at 70 m/s?

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