Explanation:
For question no 19
Force (F) = 20N
distance (d) = 5m
Work = F * d
= 20 * 5
= 100 J
Now
For question no 20
D. No matter how much force is applied the object must have motion for work to be done.
Answer:
The 19 is A and the 20 is D
Work done is N *m
So it gonna be 20N*5m
Giving 100J
The 20 work is only done when the object sets into motion
