4.A large star of 1018 kg and a small star are 105 meters apart and attract with 6.7 N. What is the mass of the small star (in kg)?   5.A car travels at 10 m/s for 20 seconds and then at 20 m/s for 30 seconds. What is the average speed (in meter/second) for the trip?   6.A car initially traveling at 50 m/s slows down at -10 m/s2 for 4 seconds. How far (in meter) does it travel during the 4 seconds?

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A: FGgg

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A: Given : m=3.18x10-28 kg v=1.25x108 m/s

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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.