How much force would be needed to accelerate a 66 kg skier at 2 m/sec

Assuming you meant:

How much force would be needed to accelerate a 66 kg skier at 2 m/sec^2:

Force(in Newtons) = mass(in kg) * acceleration(in m/s^2)

F = ma

F = (66)(2)

F = 132N

force = mass*acceleration

F = ma

F = 66 kg *  2m/s

F = 132 kgm/s

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)