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# Help on M1 question plz watch

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1. A hot-air balloon, its occupants and ballast have total mass 2000kg. The balloon is travelling horizontally with constant velocity. The occupants release 100kg of ballast. Neglecting air resistance find, in ms^-2 significant figures, the magnitude of the acceleration of the balloon.
2. Before some of the ballast has been released, the forces vertically are balanced (they must also be balanced horizontally, as it's travelling at constant velocity, but leave that for a min).

2000g = F

They then release some ballast, so the weight of the balloon has decreased. I'm assuming that the upwards force is unchanged.

Therefore, you have a net force of F - (2000 - 100)g upwards.

Newton's 2nd law: F - (2000 - 100)g = ma

Using F from above and a mass of 1900: 100g = 1900a

=> a = 100g/1900

=> a = 0.516 ms^-2
3. thx^^
4. No prob.

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Updated: May 9, 2004
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