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State the right hand rule of the direction of magnetic field in a conductor carrying current

Acar travels along a highway with a velocity of 24 m/s, west. the car exits the highway; and 4.0 s later, its instantaneous velocity is 16 m/s, 45° north of west. what is the magnitude of the average acceleration of the car during the four-second interval?

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e