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A 7.2 m long ramp is set at an angle of 42 degrees with the floor. An 11kg box is pushed up the ramp. What is the change in GPE of the box? (Answer is 340J, but how do you get that?)

Respuesta :

Answer:

Answer is 519.3 J

Explanation:

GPE = m x g x h

Object Height is equal to 7.2 x sin42  = 7.2 x 0.669 = 4.817m

GPE = 11 x 9.8 x 4.817 =519.3 J

Most probably m value (11kg) has been used as 7.2 mistakenly.