The answer is: Salt! :)
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The right answer for the question that is being asked and shown above is that:
B.
Property Electromagnet Magnet
Permanent magnet X
Temporary magnet X X
Magnetic field created by aligning domains X
<span>Moving electric charge produces magnetic field X</span>
Answer:
The mass of the cart is 150 kg.
Explanation:
Given that,
Mass of a boy, m₁ = 50 kg
Initial speed of boy, u₁ = 10 m/s
Initial speed of car, u₂ = 0 (at rest)
The speed of the cart with the boy on it is 2.50 m/s, V = 2.5 m/s
Let m₂ is the mass of the cart. Using the conservation of momentum as follows :
So, the mass of the cart is 150 kg.