Posted by ally on .
Part 1
A block of mass 4 kg, which has an initial
speed of 8 m/s at time t = 0, slides on a
horizontal surface.Find the magnitude of the work that must
be done on the block to bring it to rest.
Answer in units of J.
Part 2
If a constant friction force of magnitude
5 Newtons is exerted on the block by the surface, ﬁnd the magnitude of the acceleration of
the block.
Answer in units of m/s2.
Part 3
How far does the block slide before it comes
to rest?
Answer in units of m.

physics 
Damon,
1.
enough work must be done to reduce the Ke to zero
so
work = (1/2) m v^2 Joules
2.
a= F/m = 5/4 m/s^2
3.
work done by friction = initial Ke when it stops
5 * d = (1/2) m v^2