Two blocks of masses 8 kg and 4.3 kg are placed on a horizontal, frictionless surface. a light spring is attached to one of them, and the blocks are pushed together with the spring between them. a cord holding them together is burned, after which the block of mass 4.3 kg moves to the right with a speed of 6.7 m/s. what is the velocity of other mass in m/s?

The velocity of other mass is 3.60 m/s.

Explanation:

Given that,

Mass of first block = 8 kg

mass of second block = 4.3 kg

Speed = 6.7 m/s

We need to calculate the speed of first mass

Using conservation of momentum

where, m₁ =mass of first block

m₂ =mass of second block

m₁ =mass of first block

v₂ =speed of second block

Put the value into the formula

Negative sign represent the opposite direction of initial value.

Hence, The velocity of other mass is 3.60 m/s.

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explanation:

the answer is b, have negligible mass