Physics Question 1?

Question

An object of mass 4.0 kg is moved from a point A to a point C as follows: 0.80 m vertically from A to B, and then 0.60 m horizontally from B to C. What is the amount of work done as the object is moved from point A to C? Use g = 10 m/s squared.

a. 1.3 J from A to B and 16 J from B to C.

b. 2.2 J from A to B and 32 J from B to C.

c. 32 J from A to B and 0 J from B to C.

d. 4.0 J from A to B and 16 J from B to C.

Answer 1

From A to B. Work = mgh = 4* 10 * .8 = 32 J
From B to c Work = 4 * 10 * 0 = 0J

Answer is C

Answer 2

Under normal gravity, only the vertical displacement requires work, and that is equal to M*g*h, where M = mass and h is the net vertical displacement (end position - start position).