Aroller coaster has a mass of 250 kg. it drops from rest at the top of a hill that's 88 m tall. how fast is it going when it reaches the bottom? acceleration due to gravity is g = 9.8 m/s2.
a.41.5 m/s b.13.1 m/s c.52.2 m/s d.70.0 m/s

What if? if the temperature near the cliff suddenly falls to 0°c, reducing the speed of sound to 331 m/s, what would the initial speed of the rock have to be (in m/s) for the soccer player to hear the sound of the splash 2.90 s after kicking the rock?

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v

Alarge box of mass m is pulled across a horizontal frictionless surface by a horizontal rope with tension t. a small box of mass m sits on top of the large box. the coefficients of static and