Why is the sum of forces/net force less than the applied force? Think about the direction of the forces in your answer

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j

How can you increase the strength of an electromagnet?