projectile motion

**mathaddict** · June 4th 2009, 10:37 PM

A bomb is released from a plane which is diving at an angle of 30 degrees from the vertical . The plane is at a height of 1000m when the bomb is released . The bomb hits the ground 10s later . What is the speed of the plane when the bomb is released .

My attempt :

$s=ut+\frac{1}{2}at^2$

$1000=usin30(10)+frac{1}{2}(9.81)(10)^2$

$<br /> u= 101.9 mms^{-1}<br />$

But it is wrong .. Wonder where my mistake is .. THanks for helping me out .

**CaptainBlack** · June 4th 2009, 11:53 PM

Originally Posted by mathaddict

A bomb is released from a plane which is diving at an angle of 30 degrees from the vertical . The plane is at a height of 1000m when the bomb is released . The bomb hits the ground 10s later . What is the speed of the plane when the bomb is released .

My attempt :

$s=ut+\frac{1}{2}at^2$

$1000=usin30(10)+frac{1}{2}(9.81)(10)^2$

$<br /> u= 101.9 mms^{-1}<br />$

But it is wrong .. Wonder where my mistake is .. THanks for helping me out .

Diving 30 degrees from the vertical = diving 60 degrees from the horizontal.

Initial downward velocity component is v sin(60) m/s not v sin(30) m/s, where v is the plane's speed at weapon release.

CB

Thread: projectile motion

LinkBack

Thread Tools

Display

projectile motion

Similar Math Help Forum Discussions

Projectile Motion

Projectile motion.

projectile motion

Projectile Motion with vector functions (3D Motion in space velocity)

Projectile Motion

Search Tags