Adistance-time graph indicates that an object travels 2 m in 2 s and then travels another 80 m during the next 40 s. what is the average speed of the object?

To find the average speed, we must calculate the total distance covered by the object and then divide it by the total time of the motion.

The total distance covered by the object is

while the total time of the motion is


Therefore, the average speed of the object is

Kinetic energy = 1/2mv^2. since the mass is constant we can form a ratio of it's kinetic energy at 60 divided by that at 30 to see ke(60)/ke(30) = +(60^2)/30^2). this may be said to 300% increase.

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