When Adam applies a ‘pull’ force on the pulley, there is an output force that the pulley lets out, directly pulling the object with it. We cannot always pull up objects with our bear hands, no matter how much force we apply. Which is why pulleys allow us to apply the force and pulleys do the work of pulling the objects for us, since work and force come hand in hand.
Answer:
The block's mass should be 
Explanation:
Given:
Cart with mass 
From the conservation of energy before mass is added,
Where 
amplitude of spring mass system, 
spring constant
Now new mass 
is added to the system,
Here, given in question frequency is reduced to half so we can write,
Where 
frequency of system before mass is added, 
frequency of system after mass is added.
Therefore, the block's mass should be
"Unbalanced forces" show themselves as a change in the speed
or direction of an object's motion.
The only choice where the speed or direction of motion is changing
is the car that's slowing down for the light.
Scientists could investigate this idea by making cathode ray tubes out of different materials to see if the ray was the same.
Answer:
you start sweating and it would get hot
