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phys doubt

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Phosu:
could someone plz explain how to solve these questions

cie
Jun 02 pp1 question 14, 21 and 23

Thanks : )

Saladin:
The answer is attatched.

astarmathsandphysics:
thanks dude

Phosu:
im kinda confused with the concept of momentum

for eg ques 12 pp1 may/june 06,
the trucks collide and stick together and then the question asks to find its speed after collision, how can there be a resultant speed if they stick together on impact?

aside from that i have a doubt on solving 2 more questions from the same paper, question 33 and 34

Thanks :)

astarmathsandphysics:
They stick together and move togther - a single particle with mass m1 +m2

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