**Answer:**

2.65

**Explanation:**

Its simple just find the newtons

Answer:

b

Explanation:

The light wave will be reflected

2 gram of iron is heavier than 2 gram of a floating boat.

**Answer:**

1.24 J

**Explanation:**

The work done by a force is given by

where

F is the magnitude of the force

d is the displacement

is the angle between the directions of F and d

In this problem,

F = 0.18 N is the average force exerted by the muscles

d = 6.9 m is the displacement

(we assume the direction of the force is parallel to the displacement)

Substituting,