(i) A cart of
mass 5 kg is moving
on a straight and
smooth track
with
a speed of 1om5 A mass of
2 kg is gently put on it • What will be the velocity
엉 cart if the block das not
das not slide on the
slide on the cart?
کی
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11th
Physics
Work, Energy and Power
Collisions in Two Dimensions
A cart A of mass 50kg movin...
PHYSICS
A cart A of mass 50kg moving at a speed of 20 km/h hits a lighter cart B of mass 20 kg moving towards it at a speed of 10 km/h.The two carts cling to each other. Find the change of momentum of cart A.
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ANSWER
Momentum of cart A before collision is p
A
=50kg×20km/h=1000kgkm/h
And that of B was p
B
=20kg×(−10km/h)=−200kgkm/h
After clinging the net mass of the system will be 50+20=70kg
and if the common velocity be v then the new momentum of the system will be 70v
this new momentum should be eqaul to the net momentum before collision so 70v=p
A
+p
B
=1000−200=800kgkm/h so v=
7
80
km/h
So the new momentum of A will be p
A
′
=m
A
×v=50×
7
80
Accordingly the change is is p
A
−p
A
′
=1000−571.4=428.6kgkm/h
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