Is velocity positive or negative when acceleration is fast-slow-fast. i need with position time graphs and velocity time graphs

Solar cell a produces 100 joules of energy, when a light source is shown on it for 3 minutes. solar cell b produces 200 joules of energy when the same light source is shown on it for 5 minutes. which solar cell works better? a) solar cell b, because it produces more energy. b) solar cell b, because it generates more power. c) solar cell a, because it produces energy quicker. d) solar cell a, because it generates a greater wattage. eliminate

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

Notice how they put future which of the clouds shown would indicate a possible future rain storm? a) b) c) d)