Answer:
b) 770J
Step-by-step explanation:
We can use the formula that specifically applies to objects moving upward.
G.P.E= mgh where m is mass, g is gravitational acceleration which is constant at 9.81 m/s and h is the height.
Since mg gives the answer for weight which is the same thing as Force they have the same unit N. So we can write the formula as E= wh where w is the weight. Gravitational potential energy and Work done are the same thing since they have the same unit J.
Plug in the values:
W.D= 110×7= 770J