A1-lb block and a 100-lb block are placed side by side at the top of a frictionless hill. each is given a very light tap to begin their race to the bottom of the hill. in the absence of air resistance, what can you conclude about the outcome of the race?
a)the 1-lb block wins the race. b)the 100-lb block wins the race. c)the two blocks end in a tie. d)there’s not enough information to determine which block wins the race

The answer is c)The two blocks end in a tie

Explanation (See attachment):  

Let´s solve the general problem:

The hill is an inclined plane. We know there is no friction and no air resistance.

Let´s solve by using Energy equations and energy conservation law. At the top of the hill when the block is not moving it has a Potential Energy, as soon as it starts moving, all that Potential Energy starts converting to Kinetic Energy until it reaches the end of the hill:

1) At the top of the inclined plane we have a block of mass "m" with potential energy of , where "m" is mass, "g" is gravity acceleration and "h" is height.

2) Just an instant before the block hits the bottom, it has a Kinetic Energy of where "m" is mass, and "v" is velocity

Thanks to energy conservation law we know that Ep = Ek:

As we can see in our last equation, mass cancels out. This means that mass does not play a role in how fast this object slides down the inclined plane.

In conclusion, it doesn´t matter how much mass or how heavy the block is, it is going to slide down at the exact same velocity in a frictionless slide and without air resistance. This means, a 1lb block and a 100lb block will reach the bottom of the hill at the same time.

it takes about 30 days for it to break down

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.