Problem 1: The velocity of a particle moving along the x-axis varies
according to the expression vx = (40 – 5t 2) m/s, where
t is in seconds.
Find the average acceleration in the time interval
t=0 to t= 2.0 s.

Anybody wanna ? (picture included? )

Acapacitor is storing energy of 3 joules with a voltage of 50 volts across its terminals. a second identical capacitor of the same value is storing energy of 1 joule. what is the voltage across the terminals of the second capacitor?

The horizontal blue line through the middle of the lens is called the optical axis. as the lamp is moved above or below the axis, keeping the horizontal distance to the center of the lens constant, how does the horizontal distance from the lens to the image change?