If S=980t-490t^2, the velocity at time t =2 is??
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S = 980 t - 490 t²
we have know that,
Velocity (v) = ds/dt .
So, v = dS/dt = 980 - 980 t
Now, Velocity at time “t = 2s” is
v = 980 - 980 × 2
=> v = 980 - 1960
=> v = - 980 m/s .
Here -ve sign indicate that body will change it's direction .
Hope it's helpful to you.
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