Question

A crate is lifted vertically 1.5 m and then heldat rest. The crate has weight 100 N (i.e., it issupported by an upward force of 100 N).How much work was done in lifting thecrate from the ground to its final position?1. More than 150 J2. 150 J3. A bit less than 150 J4. No work was done.5. None of these

Answer 1

Answer:

option 1

Explanation:

given,                                    

Weight of crate = 100 N              

Crate is lifted up to height = 1.5 m

Work done =?                    

work = Force  x distance              

work = 100 N    x 1.5 m            

work = 150 J                                        

However, work would be more than the 150 J to lift the crate slightly higher to its final position.

The correct answer is option 1