What is the escape speed from a planet with of radius 4.5 x 103 km which has gravitational acceleration at the surface of 8.2 m/s2

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

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

The dot diagram represents the motion of the motorcycle as it moves from left to right