Question

If a mass of 2.0 kg is lifted through a height of 5.0 m, what force does it require to lift it at constant speed?

Answer 1

mg

Answer 2

Doesn't matter how high its lifted.
The gravitational force experience = mass * acc. due to gravity.
To balance this, an equal force in the opposite direction is required.
So first calculate the gravitational force

Answer 3

@amishra

Answer 4

Gravitational force is 9.81 m/s^2 ?
If so, Then we just use f=ma
like
F= 2*9.81 ?

Is this correct?

Answer 5

Wait... your question is what force is needed to keep it stationary or at constant speed.
If stationary...do what I told you
If constant speed, you need a net force of 0

Answer 6

but yeah that's correct

Answer 7

Wait, what force is needed to lift the object, assuming that we are moving at constant speed.

So the force should come out to be negative right?

Answer 8

Lift the object at constant speed..?

Force is a vector unit so depending on which direction you put it could be pos or neg

Answer 9

That's the question :/

Okay, thank you so much! :D

Answer 10

sure. anytime