Question

if vector r = 2.0t^2 i cap - 4.0 t j cap. find the magnitude of velocity at t =2.​

Answer 1

Answer:

(a) 

v(t)=dr/dt

        =3.0i^−4.0tj^

a(t)=dv(t)/dt

        =−4.0j^

(b) 

v(2)=3.0i^−8.0j^

v(2)=8.54m/s

∠v(2)=tan−1(−8/3)=−69.44∘with x axis