Suppose that a nascar race car is moving to the right with a constant velocity of +82 m/s. what is the average acceleration of the car? (b) twelve seconds later, the car is halfway around the track and traveling in the opposite direction with the same speed. what is the average acceleration of the car?

Since the problem says the velocity is constant, acceleration is equal to the change in velocity per unit time. Since there is no change in velocity, hence the acceleration is zero. Acceleration after substitution is (85- (-85))/12 equal to 14.17 m/s2

b.The ultimate source of energy in the biosphere is the sun.

Explanation:

The pyramid represents the energy that is initiated from the sun is then retained and stored in the new biomass and the each tropic level of the ecosystem there is 10% of the transfer of energy form one level to the next or higher level.