Question

18. The displacement of an object moving 330 km North for 2 hours and an additional 220

km North for 5 hours is
a. 110 km North
b. 220 km North
c. 330 km North
d. 550 km North
19. When something falls to the ground, it accelerates. This acceleration is called the acceleration due to
gravity and is symbolized by the letter g. What is the value of g on Earth's surface?
a. 9.8 m/s2
b. 9.8 m/s
c. - 9.8 m/s2
d. about 20 m/s2

Answer 1

Step-by-step explanation:

1) Displacement of the object will be gotten using simply adding the distances since they are goinf in the same direction (positive y direction)

Displacement= 330km + 220km

Displacement = 550km North

2) For a falling body, the body will possess positive acceleration due to gravity because it is falling under the influence of gravitational force. If a body is not under the influence of gravity and is thrown up, such body wont come back down. Hence the value of acceleration due to gravity of a body falling to the ground is +9.8 m/s² (note that the unit of acceleration is m/s²)