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 A

Explanation:

 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)

 $0+gt=0+9.8 \times \frac{1}{2}=4.9 m/s$