A ball is thrown upwards: its height above the ground as a function of time t t is defined by h ( t ) = − 5 t 2 + 40 t + 50 h(t) = -5t^2 + 40t + 50 h ( t ) = − 5 t 2 + 40 t + 50 for 0 ≤ t ≤ 8 0≤t≤8 0 ≤ t ≤ 8 . What are the values of t t for which the instantaneous velocity is positive?

t ∈ [ 0 , 4 ) t\in\left\lbrack0,4\right)

t ∈ [ 0 , 8 ) t\in\left\lbrack0,8\right)

t ∈ ( 4 , 8 ) t\in\left(4,8\right) t ∈ ( 4 , 8 )

t ∈ ( 2 , 8 ) t\in\left(2,8\right) t ∈ ( 2 , 8 )

A ball is thrown upwards: its height above the gro...

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