Use the equation for the height of an object (in meters) at time t (in seconds) given below where so is the initial height and vo is the initial velocity. s(t) = so + vot 4.9t? An object is tossed into the air vertically from ground level and returns to Earth 9.9 seconds later. Determine the exact velocity at time t =3.9.

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Chapter3: Two-dimensional Kinematics
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Use the equation for the height of an object (in meters) at timet (in seconds) given below where so
is the initial height and vo is the initial velocity.
s(t)
= 80 + vot – 4.9t²
An object is tossed into the air vertically from ground level and returns to Earth 9.9 seconds later.
Determine the exact velocity at time t =3.9.
Transcribed Image Text:Use the equation for the height of an object (in meters) at timet (in seconds) given below where so is the initial height and vo is the initial velocity. s(t) = 80 + vot – 4.9t² An object is tossed into the air vertically from ground level and returns to Earth 9.9 seconds later. Determine the exact velocity at time t =3.9.
Expert Solution
Step 1

Given information:

The position from which the object is tossed(S0) = 0 m (ground)

The time it takes to return to the earth (t) = 9.9 sec

The time at which the velocity is required (t') = 3.9 sec 

Given equation of motion:

s(t) = S0+v0t-4.9t

The total displacement at the end is "Zero" i.e. when the body reaches back to ground. we can write this as:

s(t) = S0+v0t-4.9t2=0v0=4.9(9.9)=48.51 m/s  

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