An air gun fires a pellet with a mass of 0.0010 slugs. The slug is fired from the gun, and after which possesses of 720 lb ft of kinetic energy. Find its velocity, in ft/s.

Question

harman.singh · Answer

Here is the formula for Kinetic Energy:
$$KE=\frac{ 1 }{ 2 } \times m \times v^2$$
- Solve for velocity(v)

bimbim2697 · Answer

Harman I am completely lost on this one LOL

harman.singh · Answer

That's completely okay. Here's more information:

- KE refers to the Kinetic Energy given to you in the question (720 lb ft)
- m is the mass (0.0010 slugs)
- v is the velocity that you are trying to find

Going back to the equation..
$$KE=\frac{ 1 }{ 2 } mv^2$$
$$720=\frac{ 1 }{ 2 } \times 0.0010 \times v^2$$
From here on, you can solve for 'v'.

bimbim2697 · Answer

1200

harman.singh · Answer

Yes, that's correct :)

bimbim2697 · Answer

Thanks so much!

harman.singh · Answer

You're welcome!

bimbim2697 · Answer

A sandbag is dropped from a hot air balloon at a height of 370 m above the ground. Find its velocity, in m/s, just before it hits the ground. Disregard air resistance.

bimbim2697 · Answer

85 
square of 2(9.8)(370)

harman.singh · Answer

v^2=u^2+2ax
v=sqroot of (2*9.8*370(
v=85 m/s

Yes, your answer is correct!