## amishra 3 years ago 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?

1. Algebraic!

mg

2. apple_pi

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

3. apple_pi

@amishra

4. amishra

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

5. apple_pi

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

6. apple_pi

but yeah that's correct

7. amishra

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?

8. apple_pi

Lift the object at constant speed..? Force is a vector unit so depending on which direction you put it could be pos or neg

9. amishra

That's the question :/ Okay, thank you so much! :D

10. apple_pi

sure. anytime