Question: If a projectile is launched vertically upward from the ground with an initial velocity of 70 ft per sec, then neglecting air resistance, its height

If a projectile is launched vertically upward from the ground with an initial velocity of 70 ft per sec, then neglecting air resistance, its height s (in feet) above the ground t seconds after projection is given by s = - 1612 + 70t. Which equation should be used to determine the time at which the height of the projectile reaches 20 ft? Choose the correct answer below. O A. S= - 16(20)2 + 70 O B. 20 = - 1612 + 70t O C. S= - 16(20)2 + 70(20) OD. 20 = - 1612

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