Posted by **Help** on Thursday, May 9, 2013 at 1:26am.

A cannon that is 10m long is designed to launch a 10kg ball over a castle wall.

In order to do this the ball must have a speed of at least 50m/s as it exits the

cannon. For every 10kg of explosives used, the force on the ball in the cannon

increases by 1000N. How many kg of explosives should they use?

- physical scinsce -
**Elena**, Thursday, May 9, 2013 at 3:55am
F=1000n,

F=ma,

a=F/m=1000n/10= 100n.

a=v²/2s,

v²/2s=100n,

n= v²/200s=50²/200•10=1.25.

The amount of explosive is

1.25•10 =12.5 kg.

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