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say your mass (m) is 100 kg

velocity (v) at equator = 40 030 000 / 86164 = 464.6 metres / sec

earth radius(r) = 6 371 000 metres

acceleration due to gravity at earths surface (g) = 9.82 (m/s)/s

.

gravity force at earth surface ( f = m * g) = 100 * 9.82 = 982 newtons

.

centripetal force at equator f = m * ((v^2)/r)

f = 100 * ((464.6^2)/6 371 000)

f = 3.39 newtons

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