st pic is the problem 2nd pic is the solution question to answer: why was cos80 disregarded? can you explain the encircled part of the solution ( i was confused and need to understand how it happened)

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Q: The unit of measure V. m-lis equivalent to O (to) J.C-1 O (b)N. A-¹ O (C)N. C-¹ (d)N m². C-²

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Q: Don't use ai to answer I will report your answer Solve it Asap with explanation and calculation

A: Step 1:

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.