If you want to do an experiment to see how speed affects a cart’s kinetic energy, what should you do?

a)keep everything the same except the kinetic energy of the cart.
b)keep everything the same except the speed of the cart.
c) none of the above

*i am stuck on this because i’m not sure if the answer c since shouldn’t have to do something with height? *

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not