Object a has a gravitational potential energy of 24 joules when it rests on a shelf 5m above the ground. object b has a mass that is three times the mass of object a. what would be the gravitational potential energy of object b when it rests on a shelf 10m above the ground?

Potential energy  =  (mass) (gravity) (height)

Potential energy is directly proportional to mass and also to height.

Object-B has 3 times the mass, and 2 times the height of object-A .
So its potential energy is  (3 x 2) = 6 times the PE of object-A.

           6 times (24 joules)  =  144 joules .

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