Physics · 2021
JEE Main · 27 July 2021, Shift 1 · Q18
Three objects A, B and C are kept in a straight line on a frictionless horizontal surface. The masses of A, B and C are m, 2 m and 2 m respectively.…
Three objects A, B and C are kept in a straight line on a frictionless horizontal surface. The masses of A, B and C are m, $\displaystyle 2$ m and $\displaystyle 2$ m respectively. A moves towards B with a speed of $\displaystyle 9 \mathrm{~m} / \mathrm{s}$ and makes an elastic collision with it. Thereafter B makes a completely inelastic collision with C. All motions occur along same straight line. The final speed of C is :
Official answer
(2)
$\displaystyle 3$ m/s
More from Centre of Mass and Collisions
- Consider a circular disc of radius 20 cm with centre located at the origin. A circular hole of radius 5 cm is cut from this disc in such a way that…2025
- A square shaped hole of side l=a/2 is carved out at a distance d=a/2 from the centre ' O ' of a uniform circular disk of radius a. If the distance of…2020
- An artillery piece of mass M_1 fires a shell of mass M_2 horizontally. Instantaneously after the firing, the ratio of kinetic energy of the artillery…2024
- A ball is dropped from a height of 20 m. If the coefficient of restitution for the collision between ball and floor is 0.5, after hitting the floor,…2023
- Particle A of mass m_1 moving with velocity (√3 i+ j) ms^-1 collides with another particle B of mass m_2 which is at rest initially. Let V_1 and V_2…2020
- The identical spheres each of mass 2 M are placed at the corners of a right angled triangle with mutually perpendicular sides equal to 4 m each.…2024
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason (R). Assertion: Three identical spheres of same mass…2025
- The distance of centre of mass from end A of a one dimensional rod ( A B ) having mass density ρ=ρ_0(1-x^2/L^2) kg / m and length L (in meter) is (3…2022
JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.