What is the acceleration caused by gravity on earth

Abaseball has a mass of 0.145 kg and approaches a bat at 40.0 m/s. after it is hit, the ball leaves the bat at 50.0 m/s directly back. find the impulse of the bat on the ball. 7.25 kg*m/s 13.1 kg*m/s 5.80 kg*m/s 1.45 kg*m/s

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

What will a positive and a negative charge do if they are separated from each other?