**Question :** The position coordinates of a particle moving in 𝑋 − 𝑌 as a function of time 𝑡 are 𝑥 = 2𝑡 2 + 6𝑡 + 25

𝑦 = 𝑡2 + 2𝑡 + 1

The speed of the object at 𝑡 = 10 s is approximately

(A) 31

(B) 51

(C) 71

(D) 81

**Answer :** option (B)

**Solution :**

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**Question :** The position coordinates of a particle moving in 𝑋 − 𝑌 as a function of time 𝑡 are 𝑥 = 2𝑡 2 + 6𝑡 + 25

𝑦 = 𝑡2 + 2𝑡 + 1

The speed of the object at 𝑡 = 10 s is approximately

(A) 31

(B) 51

(C) 71

(D) 81

**Answer :** option (B)

**Solution :**