Acceleration Answers

An airplane turning from south to west at constant speed is accelerating due to a change in [___].

A biker going 7 m/s west after travelling north at 5 m/s is accelerating due to a change in [___].

A runaway shopping cart speeding up as it goes down a hill is accelerating due to a change in [___].

Which statement correctly describes the differences between positive and negative acceleration?

Until a train is a safe distance from the station it must travel at 5 m/s. Once the train is on open track it can speed up to 45 m/s. If it takes a train 8 seconds to reach 45 m/s, what is the acceleration of the train? (Round your answer to the nearest whole number.)