Amass of 0.8 kg hangs from a vertical spring in the lab. the spring stiffness is 400 n / m. you pull the mass down by 4 cm, then release it from rest to set the system in motion. what is the maximum velocity of the mass during the motion

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?

Place me with this question is my last question

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=