To Find :
Position vector at time and .
Solution :
r (t) = 2 (t −7)i + 12t j
Putting t = 5 s and t = 8 s, we get :
r(5) = 2( -2 )i + 60j
r(5) = -4i + 60j
r(8) = 2i + 96j
Now, to find speed differentiating the r(t) w.r.t t :
Hence, this is the required solution.
Answer:
The velocity vector, v(t)=2i +12j
Step-by-step explanation:
The given position vector,
r (t) = 2 (t −7) i + 12t j
So, the velocity vector,
v(t)=2i +12j
Hence, the velocity vector, v(t)=2i +12j.
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