Question

A body is thrown up with a velocity of20m/s it retards uniformly at the rate of lom/s2
Find the velocity after 2 seconds
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Answer 1

0 is the correct answer....

Answer 2

Initial Velocity When Thrown Upward=20 m/s

Retards with=-10 m/s²

Here Retardation (acceleration) is in Negative as While Going Upward It's Velocity Start Becoming Less.

We have to Find Velocity after 2 seconds

Initial Velocity (u)=20 m/s

Time(t)=2 sec

Final Velocity after 2 sec(v)=??

Acceleration or Retardation=-10m/s²

Use Equation of Motion

$\bf{v = u + at}$

Where V=Final Velocity

U=Intial Velocity

a=acceleration or Retardation

T=time

we have to find (v) after 2 seconds

$\mathbf{v = 20 + ( - 10) \times 2} \\ \\ \mathbf{v = 20 - 20} \\ \\ v = 0$

$\mathtt{velocity \: after \: 2 \: seconds = 0 \: m /s}$