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6 marksConservation of Energy

CAPE Physics Unit 1 · 2003 · Paper 2 · Question 5(c)(i)

Calculate the speed at which any object will reach the ground after being released from rest from a height of 11 000 m. (Air resistance may be neglected in this calculation).

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Other parts of this question

  1. 5(a)(i)a)What is kinetic energy?[8 marks]
  2. 5(a)(i)b)What is potential energy?[1 mark]
  3. 5(a)(ii)A body of mass m starts from rest and acquires a velocity, v. Show that the kinetic energy of the mass, m, is given by E_k = (1/2)mv².[1 mark]
  4. 5(a)(iii)a)What energy change takes place when a ball bearing is falling at its terminal velocity?[1 mark]
  5. 5(a)(iii)b)What causes this energy change to take place?[1 mark]
  6. 5(b)(i)How is the force on the ball different when its value is +4 N?[6 marks]
  7. 5(b)(i)b)How is the force on the ball different when its value is -4 N?[1 mark]
  8. 5(b)(ii)Find the work done on the box during the first 5 m of movement.[1 mark]
  9. 5(b)(iii)Find the kinetic energy of the box after it has moved 8 metres.[1 mark]
  10. 5(c)(ii)An aeroplane of mass 170 x 10³ kg cruises at 900 km hr⁻¹ (250 m s⁻¹). The maximum permitted landing speed is 180 km hr⁻¹ (50 m s⁻¹). Determine the kinetic…[1 mark]

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