Question

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 1

Answer: (A)

4.9 m/s

Answer 2

According to the question,
Velocity of an object half a second before maximum height
= Velocity of an object half a second after maximum height (return journey)
$=0+g t=0+9.8 \times \frac{1}{2}=4.9 m / s$