A block of mass 1kg has speed 20m/s travelled from pt A to C

Question

Pt A to B is on flat ground.AB is 3m and BC is 5m. Pt B to C is an upslope. Height of C is 3m. Given Frictional force along BC is 5N, what is speed of block when it reaches C and what time taken for process?

Answer 1

1/2 * m * v^2  = Fd + mgh + 1/2*m*v^2

F = 5 N

d = 5 m

m = 1 kg

g = 9.81 m/s^2

h = 3 m

.5*1*400 = 5*5 + 1*9.81*3 + .5*1*v^2

v = 17 m/s

Answer 2

erm.... no idea.