A student pushes a box to the right with a force of 10 N. At the same time, another student pushes the same box to the left with a force of 5N.
What is the net force

If the speed of a particle triples ,by what factor does its kinetic energy increase?

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

A1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. what is the magnitude of the friction force required to keep the car from sliding?