JEE Main 2025 (8 Apr, Shift 2) Physics Q29: A block of…

Question

A block of mass 2 kg is attached to one end of a massless spring whose other end is fixed at a wall. The spring-mass system moves on a frictionless horizontal table. The spring's natural length is 2 m and spring constant is 200 N/m. The block is pushed such that the length of the spring becomes 1 m and then released. At distance

x

m (

x < 2

) from the wall, the speed of the block will be

(1) $10\left[1-(2-x)\right]^{\frac{3}{2}}\ m/s$
(2) $10\left[1-(2-x)^2\right]^2\ m/s$
(3) $10\left[1-(2-x)^2\right]^{\frac{1}{2}}\ m/s$ Official answer
(4) $10\left[1-(2-x)^2\right]\ m/s$

Official answer

Option 3

NTA final key.

Accepted Answer

Option 3: $10\left[1-(2-x)^2\right]^{\frac{1}{2}}\ m/s$

Answer

$10\left[1-(2-x)\right]^{\frac{3}{2}}\ m/s$

Answer

$10\left[1-(2-x)^2\right]^2\ m/s$

Answer

$10\left[1-(2-x)^2\right]^{\frac{1}{2}}\ m/s$

Answer

$10\left[1-(2-x)^2\right]\ m/s$

JEE Main 8 April 2025, Shift 2, Physics Q29

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