HELP FAST WILL MARK BRAINLEST Which of the following statements best describes how the speed and velocity of an object differ?
O Velocity specifies speed and direction, while speed has no specific direction.
O Velocity specifies a change in speed over time, while speed specifies a change in distance over time.
O Velocity specifies speed, while speed includes a specific direction.
O Velocity specifies a change in distance over time, while speed specifies a change in velocity over time.

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?