10. A constant force of 80 N acts for 8 s on a box of mass 10 kg horizontally that initially rests on a horizontal frictionless surface.
(a) Find the change in the box's momentum.
(b) Calculate the final speed of the box after the 8 s have passed.
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a)
Fdt=chng in momentum
=80×8
=640
b)
acceleration=80/10=8
time=8s
final speed=at=8×8=64
Fdt=chng in momentum
=80×8
=640
b)
acceleration=80/10=8
time=8s
final speed=at=8×8=64
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