What is the change in potential energy of a squirrel that jumps from a tree branch that is 4.5 meters off of the ground and lands on a branch 2.1 meters off of the ground if the mass of the squirrel is 1.5 kilograms?

Need in all of themmm only answer if you know plsssss

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

In a good thermo flask the main cause of heat loss is