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A 15kg cannonball and a 1kg football are dropped to the ground from a height of 10 metres. Calculate the speed of the cannonball and of the football just before they hit the ground (you may ignore air resistance).

Aim of question: demonstrate that the speed of a dropped object is independent of its mass, and depends only on the height it is dropped from. Solution: equate formulae for kinetic energy and for gravitation...
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Answered by Will R. • Physics tutor
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Calculate the momentum of a 5 tonne truck at 50km/h

We know momentum= mass (kg) X Velocity (m/s) So we need to do these conversions: 1tonne=1000kg so 5 tonnes is 5x1000kg = 5000kg There are 1000km in a meter so 50x1000= 50000m/h to get this into m/s we know t...
CZ
Answered by Callum Z. • Physics tutor
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Answered by Vicente O. • Physics tutor
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Describe the kinetic model composition of a solid

Tightly packed particles vibrating about a fixed point.
CD
Answered by Cam D. • Physics tutor
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It takes 1.8s to drop a ball of a bridge. How high is the bridge and what speed is reached?

t= 1.8s a=-9.81ms - 2 v=u+at v= -9.81 x 1.8 =17.658 m/s s= ut + 1/2 at 2 (as u is 0 s= 1/2 at 2 ) s = 1/2 x 9.81 x 1.8 2 = 15.9m
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Answered by Gabriella L. • Physics tutor
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