3. An SUV is traveling at a speed of 18 m/s. If the SUV has a mass of 1,550 kg, what force must be applied to stop it in 8 seconds? A. 2.25 N B. 4,030.7 N C. 2,700.0 N D. 3,487.5 N
An SUV is traveling at a speed of 18 m/s. [ If the SUV has a mass of 1,550 kg, the force that must be applied to stop it in 8 seconds is 3487.5 N. Solution: Vf = Vi + at; 0 = 18 + a(8) -18 = 8a; 8 a = =18; a = -18/8; A = - 9/4; F = ma; F = (1550)( - 9/4); F = - 3487.5 N. ]
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1. If the velocity of a body changes from 13 m/s to 30 m/s while undergoing constant acceleration, what's the average velocity of the body? A. 19.5 m/s B. 28 m/s C. 21.5 m/s D. 17 m/s
Weegy: If the velocity of a body changes from 13m/s to 30m/s while undergoing constant acceleration, [ the average velocity of the body is 21.5 m/s. Solution: Average speed = (1/2) (beginning speed + ending speed) = (1/2) ( 13 m/s + 30 m/s ) = (1/2) ( 43 m/s ) = 21.5 m/s. ] (More)
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