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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
GL
Answered by Gabriella L. • Physics tutor
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What is the difference between velocity and speed?

Speed is a scalar quantity, meaning it gives us information for only the magnitude, how large a quantity is. Velocity is a vector quantiy, and this means it gives us both magnitude and direction. Both speed ...
MC
Answered by Michalis C. • Physics tutor
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What is resonance

Resonance is the effect of an external driving force which causes a system to ocsillate with a greater amplitude at certain frequencies. All objects have a natural frequency, and this specific property deter...
MC
Answered by Michalis C. • Physics tutor
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A body is moving at 70km/h and has a mass of 130kg, calculate its maximum kinetic energy.

Firstly, the speed is not given in SI units, this is modified by changing the units from km/h to m/s by the following relationship; 70km/h = (70000/3600)m/s. Once this is complete the equation for kinetic en...
JI
Answered by Joe I. • Physics tutor
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What is radioactivity?

Imagine a water ballon which is slowly filling up with water. The ballon is fine and intact when there's not much water in it but what happens when we fill it so much that it can no long hold all the water? ...
EB
Answered by Eoin B. • Physics tutor
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