Atoy uses a spring to shoot an arrow with a suction cup on
the end. the toy shoots a 34.2 g arrow and gives it a speed of
5.50 m/s. if the efficiency of the toy is 69.0%, how much elastic
potential energy was stored in the spring? show all your work.

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.

Which branches of natural science include the study of an organism that lived 10 million years ago

The energy produced as a result of this flow of electrons from atom to atom is called