Question

Body of mass 8kg has linear momentum of 20 / kgm s . if the change in k.e of the body is 600j . then final momentum is
1. 1
75kgms 2. 1
100kgms 3. 1
45kgms 4. 1
90kgms

Answer 1

Answer:

truck

Explanation:

2ft 1 gt bhout the thrive

Answer 2

The final momentum is 100kgms

Given :

Mass of the body = 8kg

Linear Momentum = 20/kgm

Change in Kinetic energy = 600j

To find :

The final momentum

Solution:

We know,

Kinetic energy = 1/2mv^2

=> 600 = 1/2 × 8 × v^2

=>600 = 4 × v^2

=> 600/4 = v^2

=> 150 = v^2

$=> \sqrt{(150) } = v \\ =>12.25 = v$

Also we know,

momentum(p) = mass × velocity

=> p = 8 × 12.25

Therefore p = 98(almost 100)

Therefore the value of final momentum is 100kgms.

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