Question

A block of mass $m$ moving with velocity $V_1$ collides obliquely and elastically to a stationary block of identical mass then after collision.

• A. moving mass comes to rest and stationary mass moves with velocity $v$.
• B. both the masses move at right angle to one and other.
• C. only momentum is conserved but not KE.
• D. both KE and momentum are conserved.

Answer 1

Answer: (B), (D)

both the masses move at right angle to one and other.
both KE and momentum are conserved.

In oblique elastic collision the momentum is conserved in X and Y directions separately, also kinetic energy is also conserved. If colliding masses are same then in such collision equal masses will fly away right angles to each other.