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Sagot :
E(P)=m*g*h
=42*10*1
=420 J
E(P)=E(K)
E(K)=1/2MV^2
420=½*42*V^2
V^2=20
V=4.47
What is velocity ?
"Velocity is essentially a vector quantity. It is the rate of change of distance. It is the rate of change of displacement. Speed of an object moving can never be negative. The velocity of a moving object can be zero. "
Know more about velocity here
https://brainly.com/question/18084516
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