Given the information in the illustration and understanding that the gravitational potential energy of an object on Earth can be calculated using the formula PE = m x g x h, in which m = mass in kilograms, g = the acceleration due to gravity, and h = height in meters, what was the change in mechanical potential energy of the spring after the mass was placed on it?

Which of the following represents an upright image? a. -do b. +m c. -m d. +do

Abike rider starts from rest and accelerates 28.0 meters down a slope in 5.00 seconds. what is her acceleration? select one: a. 3.21 m/sec2 b. 1.75 m/sec2 c. 9.80 m/sec2 d. 2.24 m/sec2

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s