(a) suppose that a nascar race car is moving to the right with a constant velocity of +93 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?

Estimate the kinetic energy of the neptune with respect to the sun as the sum of the terms, that due to its daily rotation about its axis, and that due to its yearly revolution about the sun. [assume the neptune is a uniform sphere with mass = 1.0×1026 kg , radius = 2.5×1010 m , rotation period 16.1 h , orbital period 6.01×104 d and is 4.6×109 km from the sun.]