Question : The 𝑥 and 𝑦 coordinates of a particles at any time 𝑡 are given by 𝑥 = 7𝑡 + 4𝑡2 and 𝑦 = 5𝑡, where 𝑥 and 𝑦 are in meter and 𝑡 in second. The acceleration of particle at 𝑡 = 5s is
(A) zero
(B) 8ms^{-2}
(C) 20ms^{-2}
(D) 40ms^{-2}
Answer : option (B)
Solution :
