The car is traveling at a constant speed v0 = 80 km/hr on the level portion of the road. when the 4-percent (tan q = 4/100) incline is encountered, the driver does not change the throttle setting and consequently the car decelerates at the constant rate g sin q. determine the speed of the car: (a) 28 seconds after passing point a ,and (b) when s = 620 m.

11.27 m /s

2.98 m / s.

Explanation:

80 km / h = 22.22 m /s

Tanq = 4 / 100

Sinq = .0399

Deceleration acting on inclined plane = g sinq

= 9.8 x .0399

= .3910

Initial speed u = 22.22 m/s

acceleration = - .3910 ms⁻²

v = u - a t

= 22.22 - .3910 x 28

= 22.22 - 10.95

= 11.27 m /s

b ) v² = u² - 2 a s

v² = ( 22.22) ² - 2 x .3910 x 620

= 493.7284 - 484.84

= 8.8884

v = 2.98 m / s.

scientific laws are the result of testing theories and proving them to be facts.

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.