Question

A body of mass 5kg moving with velocity of 6ms collide with another body of mass 2kg which is a rest after wards they move in the same direction as befare if the velocity of the body of mass 2kg is 10ms find the velocity and acceleration of the body of mass 5kg

Answer 1

Answer:

use change in momentum

Explanation:

m1u1+m2u2=m1v1+m2v2

5*6+2*0=5*v1+2*10

30+0=5v1+20

5v1=30-20

5v1=10

v1=2m/s

Answer 2

The speed of first object is 2 m/s.

Explanation:

Given that,

Mass of first body, $m_1=5\ kg$

Speed of object 1, $u_1=6\ m/s$

Mass of another body, $m_2=2\ kg$

Initially it is as rest, $u_2=0$

Final speed of body 2, $v_2=10\ m/s$

We need to find the final velocity of first body. It can be calculated using conservation of momentum as :

$m_1u_1+m_2u_2=m_1v_1+m_2v_2$

$5(6)+0=5v_1+2(10)$

$v_1=2\ m/s$

Hence, this is the required solution.

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Conservation of momentum

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