For a block of mass m to slide without friction up the rise of height h shown, it must have a minimum initial kinetic energy of: Ogh O 2mgh O mgh O gh/2 Omgh/2Current Attempt in Progress The potential energy of a 0.20-kg particle moving along the x axis is given by U(x) = (8.0 J/m2)x2 - (2.0 J/m4)x4. When the particle is at x = 1.0m the magnitude of its acceleration is: O Om/s2 O - 8 m/s2 O 8 m/s2 O -40 m/s2 O 40 m/s2Current Attempt in Progress The energy of a system increases at a rate of 3.5 t+ 6.2 t2, in joules. What is the instantaneous power at t = 3.1 s? O 3.5W O 6.2W O 16W 0 42W 0 70W