JEE Main 2022 · 28 Jul · Shift 2 · Physics Q2

← JEE Main 2022 · 28 Jul · Shift 2

PhysicsSingle correct+4 / -1Question 2 of 90

At time t = 0 a particle starts travelling from a height $7\hat z$ cm in a plane keeping z coordinate constant. At any instant of time it's position along the $\hat x$ and $\hat y$ directions are defined as 3t and 5t $^3$ respectively. At t = 1 s acceleration of the particle will be

-30\hat y

30\hat y

3\hat x+15\hat y

3\hat x+15\hat y+7\hat z

Answer and worked solution

Official answer: B

Acceleration. $x=3t$ gives none; $y=5t^3$ gives $30t$ , so at 1 s it is $30\hat y$ .

(B)

Topics:Motion in a plane

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JEE Main 2022 · 28 Jul · Shift 2, Physics question 2