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kuromimi123 kuromimi123
  • 03-11-2015
  • Physics
Answered

A bullet is fired horizontally from a height of 78.4 m and hits the ground 2400 m away. With what velocity does the bullet leave the gun?

Verified Answer :

mumsy
mumsy mumsy
  • 03-11-2015

we have
y=78.4 m and the distance, x=2400 m

we need to find out the time in the air, t=√2y/a
where a is 9.8 m/s²
t=√ 2*(-78.4)/-9.8 m/s²= √ -156.80/ -9.8 =√16=4s

speed of the bullet will be

v=x/t= 2400/4= 600m/s

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