A roller coaster car starts from the rest from a first summit, descends a vertical distance of 45 meters and then climbs a second summit, reaching the top with a speed of 15m / s. How high is the second summit? Do not consider friction
 
        
        
        
A. 90km/h = 25 m/s
 W=1/2mv^2
 =1/2* 650* 25^2
 = 203125(J)
b. v’= 90-50= 40km/h 
 = 100/9 m/s
 W=1/2mv^2
 =1/2*650*(100/9)^2
 = 40123,45679
        
             
        
        
        
Answer:
False
Explanation:
A boat can go reverse like a car
 
        
             
        
        
        
Pressure and temperature are the variables in Gay-Lussac's law.
The law states that a pressure of a gas is directly proportional to the gas' temperature if the mass and volume are fixed. This means that there are only two variables, as the other two values are fixed: only pressure and temperature can change according to this law.