Suppose a certain type of deciduous tree releases 7500 leaves on average each fall. if the average mass of each leaf is 1.7 g and a 135,000 acre forest has 206 of these trees per acre, how many kilograms of leaves are dropped on the forest floor each fall? express the answer in scientific notation and with the correct number of significant digits.

One soccer player (a) is moving at 4 km/h when she kicks the ball while another soccer player (b) is moving at 8 km/h. what statement accurately compares their kinetic energy if they have the same mass? a) both soccer players have the same kinetic energy. b) player b has twice the kinetic energy of player a. c) player b has four times the kinetic energy of player a. d) their kinetic energy can't be compared without knowing their mass.