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impuls= perubahan momentum
F×t = mΔv
disini F tidak tetap. maka F×t disini luas grafik F-t.
0,5×4×10=1×(vt-0)
vt=20 m/s
#no 4
cari v seperti no 3 namun sampai di x=4 saja
F×t=mΔv
0,5×4×4=vt
vt=8
karena awalnya diam, Eo =0
ΔE=0,5mv^2
=0,5×1×8^2=32 J