hey question 3 'untouchablecuz' solved for me and this was his working:
http://img194.imageshack.us/img194/4369/projectile.jpg
Originally Posted by untouchablecuz
im an idiot, i didnt root the time
y=-4.9t<SUP>2</SUP>+490
t<SUP>2</SUP>=100
t=10
.'. x=u<SUB>x</SUB>t=10*100=1000m hence B...