Question

Two objects of masses 1kg & 2kg are moving with velocity 2m/s & 4m/s respectively. They collide & after collision the first object moves at a velocity 3m/s, then the velocity of second object is

Answer 1

Answer:

3.5 m/s apply law of conservation of momentum

momentum=mass ×velocity

Explanation:

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Answer 2

Given: Two objects of masses 1kg and 2kg are moving with velocity 2 m/s and 4 m/s respectively. They collide and after collision the first object moves at a constant velocity 3 m/s.

To find: Velocity of second object

Explanation: Mass of first object (m1) = 1 kg

Mass of second object (m2)= 2 kg

Initial velocity of first object (u1) = 2 m/s

Initial velocity of second object (u2)= 4 m/s

Final velocity of first object(v1)= 3 m/s

Let final velocity of second object be v2.

Using conservation of momentum which is valid for every type of collisions,

m1u1 + m2u2 = m1v1+ m2v2

=> 1*2 + 2*4 = 1*3 + 2*v2

=> 2+8 = 3 + 2 *v2

=> 10 = 3+ 2* v2

=> 2* v2 = 10-3

=> 2* v2 = 7

=> v2 = 7/2

= 3.5 m/s

Therefore, the velocity of the second object after collision is 3.5 m/s.