|
|
|
|
First law: Every body remains in a state of rest or uniform motion unless it is acted upon by an external unbalanced force.
|
|
|
|
|
|
|
|
|
First law: Every body remains in a state of rest or uniform motion unless it is acted upon by an external unbalanced force.
|
|
|
|
|
發表於 2011-1-24 01:32
| 
