Question

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Answer 1

i) Intial Momentum = mass × initial velocity

= m2 × u2

= m2u2

ii) Final Momentum= mass × final velocity

= m1 × v1

= m1v1

iii) Rate of change in momentum = mass × (final velocity - initial velocity)/ time

= m1 (v1 - u1)/ t

iv) According to law of conservation of momentum :- Total initial momentum = Total final momentum

=) m1u1 + m2u2 = m1v1 + m2v2

=) 10 × 20 + 20 × u2 = 10 × 10 + 20× 20

=) 200 + 20u2 = 100 + 400

=) 20u2 = 500 - 200

=) 20u2 = 300

=) u2 = 300 / 20

=) u2 = 15m/s

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Answer 2

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