Which of newton's laws describes why John is able to push his foot against the ground and propel his skateboard forward?

-1st
-2nd
-3rd

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.