Arock is projected upward from the surface of the moon, at time t = 0.0 s, with a velocity of 30 m/s the acceleration due to gravity at the surface of the moon is 1.62 m/s2. the height of the rock when it is descending with a velocity of 20 m/s is closest to:
(a) 145 m
(b) 155 m
(c) 135 m
(d) 125 m
(e) 115 m

What is the temperature in degrees celsius of a substance with a tempature of 49k

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=

Coal contains energy. a. light b. kinetic c. chemical d. mechanical