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Q1. At the factory, a noon whistle is sounding with the frequency of 464 Hz. As a car travelling at 76 km/h approaches the factory, driver hears the whistle at frequency fi. After driving past the factory, the driver hears frequency ff. What is the change in frequency ff - fi heard by the driver? (Suppose a temperature of 20° C.)

Q2. As a multiple of Earth's radius RE, what is the radial distance a projectile reaches if its initial speed is two-fifths of the escape speed from Earth?

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