posted by ashley .
A block is projected up a frictionless inclined plane with initial speed v1 = 3.40 m/s. The angle of incline is è = 31.1°.
(a) How far up the plane does it go?(m)
(b) How long does it take to get there? (s)
(c) What is its speed when it gets back to the bottom?(m/s)
its KE will equal the change in PE
1/2 m 3.4^2=mg*d/sin31.1
solve for d
How long? its average velocity is 3.4/2, the distance above, so t=distance/avgvelocity
when it returns to bottom, same speed as started, opposite direction.