Ruth throws a baseball straight up at 17 m/s. What is the ball's velocity after 1.7 seconds?

To protect all four receptacles on a branch circuit that surrounds a swimming pool, you would install which of the following configurations? a. gfci feed-through receptacle at the end of the load's circuit b. gfci-terminated receptacle at the beginning of the load's circuit c. gfci feed-through receptacle at the beginning of the load's circuit and the other receptacles connected to the load side of that receptacle d. gfci-terminated receptacle at each end of the load's circuit

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Can anybody me with this? ? (picture included.)