How fast is the object moving 9s after being thrown

Reference no: EM13179212

An object thrown vertically upward from the surface of a celestial body at a velocity of 28m/s. Its distance from the surface at t second is given by s=-0.7t^2+28t
a. How fast is the object moving 9s after being thrown?
b. How long after the object is thrown does it reach its maximum height?
c. How high will the object goes?

Reference no: EM13179212

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