Un cuerpo de masa 40Kg resbala por el plano inclinado y liso y llega al suelo con una velocidad de 20 m/s. Si mediante la ley de conservación de energía determinamos que la energía
potencial inicial es la misma que la energía cinética final. Determinar:
a).- La energía potencial inicial

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.)

Does the asteroid belt revolve around the sun?

Atruck travels at an average speed of 70 km/hr. if it travels 100 km in the first hour, how far will it go the second hour of a 2 hour trip? if you could also give me the steps that would great.