Problem: Suppose we are on a space ship generating a beam of electrons. In our reference frame, the electrons are traveling in the +x direction with a speed of 0.87c. Our space ship passes by the Earth. In the Earth's reference frame, the space ship is traveling in the +x direction with a speed of .74 c.
Part A: Find the speed of the electrons in the Earth's reference frame.
I need tutor help to solve the above problem and give the speed in terms of c.