A football, originally kicked at an 40-degree angle to the horizontal,
is at the peak of its trajectory.
Ignore air resistance.
Free Body Diagram

The force it would take to accelerate an 900-kg car at the rate of 6m/s2

If a star is moving toward earth, it is

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)