The 0.045 kg golf ball makes a perfectly elastic collision with a wall and bounces back. The ball was in contact with the wall for 0.01 s and the wall imparts a force of 40 N on the ball. What was the initial velocity of the ball just before it hit the wall?

Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?

Metals are good conductors of electricity because they

Which of hubble’s discovery support the big bang theory