When exiting the highway, a 1200 kg car is travelling at 22.2 m/s. The car\'s ki

Question

When exiting the highway, a 1200 kg car is travelling at 22.2 m/s. The car's kinetic energy decreases by 0.141 MJ. On the exit ramp the speed limit sign reads 35 mi/h. What was the car's speed at the speed limit sign? Did the drive reduce the car's speed enough? A car manufacturer is testing the bumper of their cars. A moving car has 32,000 J of kinetic energy while moving at 16.0 mi/h. A spring loaded automobile bumper compresses 30.1 cm when the car hits a wall and stops. How much is the spring constant K? If friction was present, how will your answer for k change? After falling 16.7 m, a 0.0570 kg tennis ball has a speed of 12.7 m/s (ball's initial speed is zero). Determine average resistive force of the air that is opposing the ball's motion.

Explanation / Answer

Multiple questions I am allowed to answer only 1 question at a time According to the chegg guidelines.

Solving last part becasue both parts are looking blurry.

According to the work energy theorm :

m g s - f s = 1/2 m v^2 ( Now we can rearrange for the values of f we get )

f = m g - m v^2 / (2 s) = 0.0570 kg * 9.8 - ( 0.0570 kg * 12.72 ) / 2 * 16.7

f = 0.28334461 Newton ==========================ANSWER)

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