1) An object is thrown vertically upward with a speed of 30 m/s. The velocity of the object half -a- second before it reaches the maximum height is A) 4.9 m/s B) 9.8 m/s C) 19.6 m/s D) 25.1 m/s Answer: Option AExplanation: According to the question, The velocity of an object half a second before the maximum height = Velocity of an object half a second after maximum height (return journey) $0+gt=0+9.8 \times \frac{1}{2}=4.9 m/s$
