A 0.057 kg tennis ball and a tennis racket collide. The racket has an initial momentum of -2.80 kg. m/s and a final momentum of -1.97 kg m/s. The ball
has an initial momentum of 0.02565 kg-m/s. If you assume the collision is
elastic, what is the final velocity of the ball?
A. -0.80 m/s
B. -83.26 m/s
C. -14.11 m/s
D. -4.75 m/s

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

i think the answer would be reserve.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

i think its c if i'm wrong