A stone is thrown upwards from the top of a cliff. After reaching its maximum height, it falls pastthe cliff-top and into the sea.The graph shows how the vertical velocity v of the stone varies with time t after being thrownupwards. R and S are the magnitudes of the areas of the two triangles. What is the height of the cliff-top above the sea?
1 )
R
2 )
S
3 )
R+S
R-S
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