Question

What is the value of work done on an object when a 70–newton force moves it 9.0 meters in the same direction as the force? A. 7.8 joules B. 6.3 × 102 joules C. -7.8 joules D. 0 joules

Answer 1

Answer:

B. 6.3 × 10² J

Explanation:

The formula for work (w) done is

w = f×d

f = 70 N

d = 10 m

w = 70 × 10

w = 700 J = 7 × 10² J

w is positive because work is being done on the object.

Answer 2

Answer:

B. 6.3 x 10² Joules

Explanation:

Work is the product of force and distance.  

w = F x d  

where w is the work, F is the force and d is the distance.  

Given,  

F = 70 N, N or Newton is the SI unit of force

d = 9.0 m, m is the SI unit of distance

Plugging the number in the work equation we have,  

w = 70 N x 9.0 m = 630 J , Joules is the SI unit of work

Expressing 630 J in scientific notation we get, 6.3 x 10² J