Acar has a forward acceleration. how would the acceleration of the car be different if it had more mass

An object moves from the position +34m to the position -15m in 15 seconds. what is it's total displacement? what is it's average velocity?

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

In a system, when potential energy decreases, then entropy also decreases. true false