Type of energy

Diagram shows a boy of mass 70 kg cycling up a hill from P. The boy takes a rest for a while at Q before continue to R.
Rajah menunjukkan seorang budak lelaki berjisim 70 kg berbasikal menaiki sebuah bukit daripada P. Budak itu berehat seketika di Q sebelum meneruskan ke R.

(a) State the type of energy of the boy at Q.
     Nyatakan jenis tenaga budak itu pada Q.
     .......................................................................................................


(b)(i) State the change of the energy of the boy when he is cycling down from Q to R.
         Nyatakan perubahan tenaga budak itu apabila dia berbasikal turun daripada Q ke R.

         .......................................................................................................

     (ii) Calculate the velocity of the boy at R.
          Hitung halaju budak itu di R.











(c) State the Physics principle involved
      Nyatakan prinsip fizik yang terlibat

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Tenaga Keupayaan graviti

Tenaga Keupayaan Graviti ke Tenaga kinetik

31.62 m/s

Prinsip Keabadian Tenaga