Answer:
The velocity of the block is 231650.8 ft/s
Explanation:
Knowing
W = 10 lb
v0 = u = 4 ft/s
F = 8 
lb
ms = 0.2
Applying the newton second law
ΣFy = 0
N - W = 0 --> N = W = 10 lb
ΣFx = m
F - ms N = ma
- 0.2(10) = 
a = 
Using Kinematics
a = dv/dt
= 
= 
v - 4 = 3.22 
when t = 30
v = 231650.8 ft/s
Since velocity describes both speed and direction, you can call it a "vector" quantity, and legitimately label it "velocity".
Since speed has no direction, it's a scalar quantity, and it's wrong to call it "velocity" as so many often do.
Your answer would be true. Hope I helped. :)
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