and if you want to use lines like
If speed#>2 And EntityCollided(plane,TERRAIN) Then status$="SOFT COLLISION" : health=health-1
If speed#>10 And EntityCollided(plane,TERRAIN) Then status$="MEDIUM COLLISION" : health=health-5
If speed#>15 And EntityCollided(plane,TERRAIN) Then status$="HARD COLLISION" : health=health-10
If speed#>20 And EntityCollided(plane,TERRAIN) Then status$="DEADLY COLLISION" : health=health-50
add ">0" to the EntityCollided() :
If speed#>2 And EntityCollided(plane,TERRAIN)>0 Then status$="SOFT COLLISION" : health=health-1
If speed#>10 And EntityCollided(plane,TERRAIN)>0 Then status$="MEDIUM COLLISION" : health=health-5
If speed#>15 And EntityCollided(plane,TERRAIN)>0 Then status$="HARD COLLISION" : health=health-10
If speed#>20 And EntityCollided(plane,TERRAIN)>0 Then status$="DEADLY COLLISION" : health=health-50
A number > 0 is assumed to be true so the > 0 is unecessary.