Question

QUESTION 3 10 points Saved For the blocks in the diagram, rank the situations in order of the work done if the motion is upward (toward top of page) instead of to the right. In all cases, the forces are equal in magnitude and the displacements are of the same magnitude o 1.a, d, c&b 2.c, a, d, b 3.c&b, d, a 4.f, c&b, a QUESTION 4 10 points Saved A block starts from rest at the top of a ramp 2.0 m high. It slides down the ramp and at the bottom its speed is 5.2 m/s. Based on this result, we can say that the ramp was frictionless True False

Answer 1

(A) work is defined

W = F.d.cosQ

So work is product of displacement and component of force in direction of displacement.

So option(a) will be correct.

(B) false

if ramp is frictionless than speed at bottom-

v² = 2gh = 2×9.8×2

v = 6.26m/s

It means ramp has friction