Question

What is the energy of work done lifting 2kg mass rocket to a height of 130 m

Answer 1

Work done = force × distance travelled in the direction of the force
Force= 2(9.81) = 19.62N
WD= 19.62×130= 2550.6Nm

Answer 2

Work done to lift the mass is given by

W = mgH

here we know that

m = mass = 2 kg

g = acceleration due to gravity = 9.8

H = height = 130 m

now using the above equation we can write

$U = 2* 9.8 * 130$

$U = 2548 J$

so the energy required to do the work is 2548 J