Aracquetball strikes a wall with a speed of 30 m/s and rebounds with a speed of the collision takes what is the average acceleration of the ball during the collision?

200 m/s2

zero

2800 m/s2

1300 m/s2

1500 m/s2

What is the electric force acting between two charges of -0.0045 c and -0.0025 c that are 0.0060 m apart? use fe=kq1q2/r^2 and k = 9.00 x 10^9 n*m^2/c^2 a. 1.7 x 10^7 n b. -1.7 x 10^7 n c. -2.8 x 10^9 n d. 2.8 x 10^9 n

Could someone me find the answer to this problem.

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?