In order to go from her office to her favorite pizzeria for lunch, a woman walks due east (polar angle of 0^ 0 ) an average speed of 3.2 m/s for 5 minutes and then walks due north (polar angle of 90^ o ) for 4 minutes at an average speed of 2.7 m/s . (a) What distance does she walk to get to the pizzeria ? (b) What is the avernge speed for her trip?

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Q: A cannon ball is launched into the air with an upward velocity of 350 feet per second, from a 7-foot…

A: The initial upward velocity of the cannonball is v = 350 ft/s The height of the cannonball after t…

Q: launch angle

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A: Suppose a hiker walked 65 m, 25 degrees east of north. What are the x and y-components of his…

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Q: (a) How much is the initial speed vo? (b) What is its speed just before hitting the base of the…

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A: To solve this problem we use equation of motion

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A: Given data: The initial downward speed is va=-1.1 m/s. The height of rooftop is h=-36 m.

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.