Knowing the force and distance allows you to calculate the work done.
Then, if you know the TIME, you can calculate the power.
        
             
        
        
        
Answer:
Explanation:
When we do multiple trials of the same experiment, we can make sure that our results are consistent and not altered by random events. Multiple trials can be done at one time. If we were testing a new fertilizer, we could test it on lots of individual plants at the same time.
 
        
             
        
        
        
Answer: 
According to the data given in the question, experiment on table two pulling and falling masses are arranged in the fig. 250  g is pulling right side and   100 g pulling down. The gravitational force is common to both the masses, so we cannot say that the block moves towards heavier mass, also the block  does not move towards the lighter mass.
Obviously, the effect of heavier mass of 250 g is more on the block, so the block moves towards right bottom corner. i.e., diagonally between two masses
please find the attachment.
 
        
                    
             
        
        
        
The kinetic energy with which the hammer strikes the ground 
is exactly the potential energy it had at the height from which it fell.  
Potential energy is (mass) x (gravity) x (height) .... directly proportional 
to height.
Starting from double the height, it starts with double the potential 
energy, and it reaches the bottom with double the kinetic energy.