A ball reaches a height of 1.4 m after first impact with the surface. a. calculate the g. p.e of the ball of 50g dropped from 2.5cm.

b. calculate the energy loss on the impact with the surface.

c. state 2 types of energy into which the gravitational potential energy is converted on impact with the surface.

HELP pl.

Within a pendulum, as potential energy decreases, energy increases. a. heat b. kinetic c. frictional d. gravitational

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%