Question

What's the displacement of a body which is thrown vertically up with a velocity of 30 m/s after 6 seconds​

Answer 1

Answer:

4.9m/s

Explanation:

Velocity half second before maximum height = Velocity half second after maximum height (Return journey)

For downward journey : 

Initial velocity  u=0 m/s   

We have  g=9.8 m/s2

Time  t=21 s

Thus velocity after half second  v=u+gt 

v=0+9.8×21=4.9m/s

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