The discussion revolves around a physics problem involving a body of mass 8.0 kg on a frictionless surface, subjected to a force of 18 N, and its resulting motion characterized by distance traveled, work done, and kinetic energy. Participants are exploring concepts related to work and energy, as well as equations of motion.
The conversation includes multiple interpretations of the calculations, with some participants providing their reasoning and others seeking clarification on the methods used. There is an emphasis on the need to show work for verification and understanding.
Some participants express confusion regarding the calculations and the equations used, indicating a need for clearer definitions or assumptions about the problem setup. There are no explicit homework rules mentioned, but the discussion suggests a focus on understanding the underlying principles rather than simply confirming answers.
The first two look somewhat promising (I'd be more definitive about it though if you showed your work).red1312 said:x= 32 m
W= 576 J
KE = still 48 J
Am I right ??
Now that can't be true! How are you doing any calculations?red1312 said:Homework Statement
A body of mass 8.0 kg is initially at rest on a horizontal frictionless surface. A
force of 18 N acts on it and accelerates it to a final velocity of 12 m/s. Calculate
(a) the distance travelled,
(b) the work done by the force,
(c) the final KE of the body,
Homework Equations
NONE
You need to show how you got your results. We can't just confirm results, we need to see your work. In that way we can help you to understand where your process is correct or incorrect.The Attempt at a Solution
(a): x=7.35
(b) W= 132.3 J
(c) KE= 48 J
Yes! Well done for each!red1312 said:Okey
(a) F=ma
18=8a
a=2.25
v^2=v0^2+2ax
x= 32m
(b) W=Fd
= 18(32)
= 576 J
(c) KE= 1/2 mv^2
= 8(144)/2
= 576 J