Question : The position of a particle 𝑥 (in meter) at a time 𝑡 second is given by the relation 𝑟 = (3𝑡𝐢̂− 𝑡 2 𝐣̂+ 4𝐤̂ ). Calculate the magnitude of velocity of the particle after 5 s.
(A) 3.55 m/s
(B) 5.03 m/s
(C) 8.75 m/s
(D) 10.44 m/s
Answer : option (D)
Solution :
