When studying the motion of an object, we can analyze it using kinematic equatio

Question

When studying the motion of an object, we can analyze it using kinematic equations or energy equations. Both types of equations give information about position and velocity. Kinemat equations give information about the motion of an object from moment to moment, while energy equations typically detail the initial and final points of the motion. Consider a car traveling at 8 m/s. When the driver breaks the car travels 14 meters before coming to a stop If the initial speed of this car doubles, the distance required to stop this car: Incorrect Increases by a factor of V2 Incorrect None of these Correct: Increases by a factor of 4 IncorrectRemains the same IncorrectIncreases by a factor of 2 Computer's answer now shown above. Incorrect. Tries 2/2 Previous Tries If the mass of the car doubles but the initial speed remains the same, the distance required to stop the car: Correct:Remains the same IncorrectIncreases by a factor of 2 Incorrect None of these Incorrect Increases by a factor of V2 Incorrect Increases by a factor of 4 Computer's answer now shown above. You are correct. Your receipt no. is 163-4237 What work is being done on a car moving with a constant speed along a straight, level road? I. No work of any kind II. Work is being done on the car III. Work is being done by the car O I only II only II and III only III only I, II, and II Submit Answer Incorrect. Tries 1/2 PreviouS Tries

Explanation / Answer

Q.3 ( work is done by the car )

III rd only

Q.4 let;s compare two energies

1/2 ( m10^2 - m0^2) = m/2 ( 100)

1/2 ( m20^2 - m10^2) = m/2 ( 300)

Three times as much

Q.5:1/2 (2m)V1^2 = 1/2 (m)v2^2

2v1^2 = v2^2

V1/V2= sqroot ( 1/2)

option 4

accelertaion= v^2/ 2s= 8^2/ ( 2 x 14) = 2.285 m/s^2

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