Physics WAEC

A uniform metre rule of mass 90g is provided at the 40cm mark. If the rule is in equilibrium with an unknown mass m placed at the 10cm mark and a 72g mass at the 70cm mark, determine M

A. 72g
B. 102g
C. 298g
D. 504g

Correct Answer: Option B

B. 102g

SEE ALSO A ball is projected horizontally from the top of a hill with a velocity of 20m/s. If it reaches the ground 4 seconds later, what is the height of the hill? (g = 10m/s²)
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