Question

Suppose a tourist threw a rock with an initial velocity of 8.0
m/s (down). Determine the velocity at 4.0 s. The acceleration of gravity is 9.81 m/s

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Answer 1

Answer:

using kinemetical equation,

v=u+at

u=8m/s

t=4.0s

the rock is thrown downward so it is in accelerated motion or free fall,

v= (8+ 9.81×4) m/s

v= 47.24m/s

a=9.81m/s²