A tennis ball is fired from the ground vertically upward with an initial velocity of 29 m/s. The tennis ball arrives at its maximum altitude in 3.0 seconds. Neglecting air resistance, what is the velocity of the ball after 3.0 seconds of the acceleration due to gravity is -9.81 m/s^2

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects