Answer:
Step-by-step explanation:
We know:
KE=12mv2=Fd
KE=
2
1
mv
2
=Fd
Where Fd=umgdFd=umgd Thus,
12mv2=umgd
2
1
mv
2
=umgd
12v2=ugd
2
1
v
2
=ugd
v2=2ugd
v
2
=2ugd
v=2ugd−−−−√
v=
2ugd
v=2(0.3)(9.81)(78)−−−−−−−−−−−−−√
v=
2(0.3)(9.81)(78)
v=21.4m/s
v=
21.4m/s
Part B
The cars mass does not matter because we can see that the mass cancels out from both sides of the equation.
