Answer:
The force is 274 N.
Explanation:
In figure 2:
(d) Let the tension in the string is T.
According to the Newton's second law,
Net force = mass x acceleration
Apply for 200N.

Now put in (1)
T - 114.7 = 20.4 x 7.81
T = 274 N
I think it’s contact I’m not sure
Answer:
F-F(gr) = ma
a= {F-F(gr)}/m =
=(15-10)/15=0.33 m/s² (upward)
Friction is a forces that slows things down.