Basic SUVAT stuff
A bullet is fired horizontally at a speed of 200m/s at a target which is 100m away. Ignoring air resistance calculate how far the bullet has fallen when it hits the target.
I used
average v=s/t
200=100/t
200t=100
t=100/200
t=0.5s
then I said gravity was 9.81m/s/s and so i did
t*gravity = distance travelled down
0.5*9.81= 4.905m
The answers said it was 1.2m travelled down. How do you get there?
Thanks in advance
I used
average v=s/t
200=100/t
200t=100
t=100/200
t=0.5s
then I said gravity was 9.81m/s/s and so i did
t*gravity = distance travelled down
0.5*9.81= 4.905m
The answers said it was 1.2m travelled down. How do you get there?
Thanks in advance
ooh i did t*gravity because i thought gravity = distance travelled down
thanks : ) i forgot about the equations :/ Silly me.
thanks : ) i forgot about the equations :/ Silly me.
t*gravity =/= distance
t*a (=t*g) would be the increase in speed (or the final speed in this case, as the initial vertical speed is 0). This can be seen just by looking at units:
Units of (t*a) = Units of t * units of a = s * m/s^2 = m/s. This is a unit of velocity.
TenOfThem (post 2) gives you the right equation to use.
t*a (=t*g) would be the increase in speed (or the final speed in this case, as the initial vertical speed is 0). This can be seen just by looking at units:
Units of (t*a) = Units of t * units of a = s * m/s^2 = m/s. This is a unit of velocity.
TenOfThem (post 2) gives you the right equation to use.
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