Is it possible for speed to be constant while acceleration is not zero? physics

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Isla’s change in velocity is 30 m/s, and hazel has the same change in velocity. which best explains why they would have different accelerations? isla had negative acceleration, and hazel had positive. isla had a different time than hazel. isla had positive acceleration, and hazel had negative. isla went a farther distance than hazel.

When an object is heated it contracts. a. true b. false