A cannon launches a cannonball with an initial speed 210 m/s at a 70° angle from the horizontal.
If the cannonball has a mass of 25 kg, how much work does it take to launch the cannonball to 1.985 kilometers?

Question

A cannon launches a cannonball with an initial speed 210 m/s at a 70° angle from the horizontal.
If the cannonball has a mass of 25 kg, how much work does it take to launch the cannonball to 1.985 kilometers?

anonymous · Answer

1.985 km vertically?
Just find the potential energy at that height.

anonymous · Answer

For whihch u have to Find Time of flight........or is it like wat cliff said...is it vertical distance or Horizontal

anonymous · Answer

Why those equations, @Yahoo! ? The force is the weight of the cannonball.

anonymous · Answer

Vertical distance

anonymous · Answer

1.985 is the maximum height

anonymous · Answer

Yup...u r correct...@CliffSedge  have nt thought that......

anonymous · Answer

sorry P.E = mgh

anonymous · Answer

I'm tempted to answer this question with "More work than the canon is capable of."

@Yahoo! yes.

anonymous · Answer

Lol...)

anonymous · Answer

Naw, but seriously, considering significant figures, the max height is between 1980 and 2000 meters, so 1985 m is within the margin of error.

anonymous · Answer

But, yeah, anyway Work = change in potential energy. Potential energy = mgh.

anonymous · Answer

So would g almost always equal 9.8?

anonymous · Answer

It has an average of 9.81 near sea-level on the Earth. It varies from place to place and decreases with height, but g=9.8 is always safe to use for these sorts of terrestrial problems.