An airplane during departure has a constant acceleration of 3 m / s². a. What is the speed that the plane reaches in 4 s? b. If the plane passes at a flight point of at a speed of 20 m / s, what is the speed 8 s later?

Identical marbles are released from the same height on each of the following four frictionless ramps . compare the speed of the marbles at the end of each ramp. explain your reasoning

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest