Question: If a projectile is shot vertically upward from the ground with an initial velocity of 100 ft per sec, neglecting air resistance, its height s

If a projectile is shot vertically upward from the ground with an initial velocity of 100 ft per sec, neglecting air resistance, its height s (in feet) above the ground t seconds after projection is given by s= -16t^2 + 100t

a) After how many seconds will it be 50ft above the ground ?

B) How long will it take for the projectile to return to ground ?

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2. In what way can we say that method affects the result we get?

4. In what way will relationships in a system influence what is reported?