The answer is: d) 981 J
To calculate the potential energy, we need to know the height of point A. Since this information is not provided, we can assume that point A is at the same height as the starting point of the track. Therefore, the height (h) is zero.
PE = m x g x h = 20 kg x 9.81 m/s² x 0 m = 0 J
So, the potential energy at point A is zero. The correct answer may have been intended to be the kinetic energy, which is:
KE = 0.5 x m x v² = 0.5 x 20 kg x (v at point A)²
Without knowing the speed of the cart at point A, we cannot calculate the kinetic energy.
Calculate the potential energy of a 20 kg cart rolling through the track at point A.
PE = m x g x h KE = 0.5 x m x v2
a
80 J
b
1,962 J
c
40 J
d
981 J
1 answer
1 answer