- #1
x2017
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Homework Statement
A 100 N net force acts on a 100 kg block (initially at rest) for 4s
a. How much work was done on the block? (1)
b. What is the block’s velocity after the 4 s? (1)
c. How much energy does the block have after this time?(1)
d. The 100 N net force is no longer acting on the block. If the block slides an additional 3 m before coming to rest, what average force must have acted on the block over those 3 m? (1)
Homework Equations
P=W/t
work done = change in energy
Hooke's Law: Fs=kΔx
Ws=(1/2)kΔx2
KE=(1/2)mv2
PEg=mgh
SE=(1/2)kΔx2
Total energy = KE+PE+SE
W=FΔd
The Attempt at a Solution
The only information I have is:
F=100N
m=100kg
Δt=4s
All of the equations I have require information I don't have so I am very confused as to how to attempt this question.
W=FΔd was what I thought I should be using, but I don't have Δd. Then I thought maybe this one: Ws=(1/2)kΔx2, but I don't have k OR Δx...