What is the frequency heard by a stationary observer when a train approaches with a speed of 30?

What is the frequency heard by a stationary observer when a train approaches with a speed of 30? Given. Speed of the train, vs=30ms−1. Frequency of the train, n=600Hz. Speed of sound, v=340ms−1. What is the whistling of an engine approaching a stationary observer with a velocity of 110 Metre per second? A whistling engine

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What is the magnitude of net force acting on a car moving with constant velocity of 30 km h on a rough road?

What is the magnitude of net force acting on a car moving with constant velocity of 30 km h on a rough road? Zero net force A car is moving with a rough road with a constant hence,its acceleration is zero.As per Newton’s second law of motion,no net force us acting on the car. What

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