If a projectile is launched vertically upward from the ground with an initial velocity of 90 ft per sec, neglecting air resistance, its height s (in feet) above the ground t seconds after projection is given by s= - 161 + 90t. 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 + 90 O B. 20= - 16t + 90t O C. 20= -16t Click to select wour answer 10:36 AM 2/19/202

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