It is number 3 because I know it is
Answer:
-7.04
Explanation:
9.8 multipled by -0.719 b
Answer:

Explanation:
Assume that the distance travelled initially is d.
In order to stop the block you need some external force which is friction.
If we use the law of energy conservation:

a)
Looking at the formula you can see that the mass doesn't affect the distance travelled, as lng as the initial velocity is constant (Which indicates that the force must be higher to push the block to the same speed) therefore the distance is the same.
b) If the velocity is doubled, then the distance travelled is multiplied by 4, because the distance deppends on the square of the velocity.
The correct answer should be a
The earth
The earths mass is what generates the force to draw you in. The deeper you go, sorry the more above you the less the pull will be