Answer:
B type ii supernova is the right answer
it is a measure of the heat content of fuels or energy sources
Explanation:
Final velocity=v
1.25 m/s^2
m = 76 kg, R = 840 N
Let a be the acceleration of teh elevator in upward direction.
By use of Newton's second law
R - mg = m a
R = m ( g + a)
840 = 76 ( 9.8 + a)
a = 1.25 m/s^2
sorry dk
