A cannonball is shot and lands on top of an 80-meter hill. The initial velocity of the cannonball is fired at 100m/s at an angle of 30 degrees. the end of the cannon is 2 meters off the ground a. how long is the cannonball in the air?
b. what is the final velocity of the cannonball just before it hits the ground?

Use the empirical rule. the mean speed of a sample of vehicles along a stretch of highway is 70 miles per hour, with a standard deviation of 4 miles per hour. estimate the percent of vehicles whose speeds are between 66 miles per hour and 74 miles per hour. (assume the data set has a bell-shaped distribution.)

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Akg a of 55 m at an of 11 ? . if is at 98 km/h,be ?