A 5.30-kg object is initially movingso that its x -component of velocity is 6.00

Question

A 5.30-kg object is initially movingso that its x-component of velocity is 6.00 m/s andy-component of velocity is -1.80 m/s.

(a) What is the kinetic energy of the object atthis time? (Joules)
1

(b) Find the change in kinetic energy of the object it itsvelocity changes so that its new x-component is 8.50 m/sand its new y-component is 5.00 m/s. (Joules)



Thanks.
2
(a) What is the kinetic energy of the object atthis time? (Joules)
1

(b) Find the change in kinetic energy of the object it itsvelocity changes so that its new x-component is 8.50 m/sand its new y-component is 5.00 m/s. (Joules)



Thanks.
2

Explanation / Answer

Mass of the object m = 5.30 kg               Kinetic Energy K.E = 1/ 2m ( vf -vi )2                                                 =1 /2 * 5.30 kg * ( - 1.80 m/s - 6.00m/s )2                                                = 161.2 J      change in Kinetic energy K.E ' = 1 /2 m ( vf - vi )2                                                      = 1 /2 * 5.30 kg ( 5.00 m/s - 8.50 m/s )2                                                      = 32.4 J                                                = 161.2 J      change in Kinetic energy K.E ' = 1 /2 m ( vf - vi )2                                                      = 1 /2 * 5.30 kg ( 5.00 m/s - 8.50 m/s )2                                                      = 32.4 J

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