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A vehicle is driven along a straight horizontal track by a motor which exerts a constant driving force. The vehicle starts from rest at t = 0 and the effects of the friction and air resistance are negligible. If the kinetic energy of the vehicle at time t is E and power developed by the motor is P, which of the following graphs is/are incorrect?
  • a)
    (i) and (iv) only
  • b)
    (ii) only
  • c)
    (i) only
  • d)
    (ii) and (iii) only
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A vehicle is driven along a straight horizontal track by a motor which...
Since, force on the vehicle is constant, it will move with a constant acceleration. For particle starting from rest, velocity, v = at
∴ Graph of E versus t will be parabola of increasing slope. Thus, graph (iv) is correct.
Power associated with force is equal to, P = Fv = Fat Thus, graph of P versus t will be a straight line. Hence, graph (i) is correct. And graphs (ii) and (iii) are incorrect.
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A vehicle is driven along a straight horizontal track by a motor which exerts a constant driving force. The vehicle starts from rest at t = 0 and the effects of the friction and air resistance are negligible. If the kinetic energy of the vehicle at time t is E and power developed by the motor is P, which of the following graphs is/are incorrect?a)(i) and (iv) onlyb)(ii) onlyc)(i) onlyd)(ii) and (iii) onlyCorrect answer is option 'D'. Can you explain this answer? for Class 9 2025 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about A vehicle is driven along a straight horizontal track by a motor which exerts a constant driving force. The vehicle starts from rest at t = 0 and the effects of the friction and air resistance are negligible. If the kinetic energy of the vehicle at time t is E and power developed by the motor is P, which of the following graphs is/are incorrect?a)(i) and (iv) onlyb)(ii) onlyc)(i) onlyd)(ii) and (iii) onlyCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 9 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A vehicle is driven along a straight horizontal track by a motor which exerts a constant driving force. The vehicle starts from rest at t = 0 and the effects of the friction and air resistance are negligible. If the kinetic energy of the vehicle at time t is E and power developed by the motor is P, which of the following graphs is/are incorrect?a)(i) and (iv) onlyb)(ii) onlyc)(i) onlyd)(ii) and (iii) onlyCorrect answer is option 'D'. Can you explain this answer?.
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