What is the momentum of the electron measured in mev/c units? (enter only a number without the mev/c unit.)

Initially, a particle is moving at 5.33 m/s at an angle of 37.9° above the horizontal. two seconds later, its velocity is 6.11 m/s at an angle of 54.2° below the horizontal. what was the particle's average acceleration during these 2.00 seconds in the x-direction (enter first) and the y-direction?

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?