The Apollo 15 mission landed on the moon in 1971 the astronaut David Scott dropped a hammer and a feather they were released form rest at the same time and from the same height the hammer and the feather landed at the same time

The duration of a photographic flash is related to an rc time constantly

Iwould say a is accurate

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

Work is reduced while time is decreased