(a) What is the kinetic energy in joules of a 1019 kg automobile traveling at 89

Question

(a) What is the kinetic energy in joules of a 1019 kg automobile traveling at 89 km/h?
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(b) How much work would have to be done to bring a 1019 kg automobile traveling at 89 km/h to a stop?
J
A man pushes a lawn mower on a level lawn with a force of186 N. If 48% of this force is directed downward, how muchwork is done by the man in pushing the mower 5.3 m?
J
(a) What is the kinetic energy in joules of a 1019 kg automobile traveling at 89 km/h?
J

(b) How much work would have to be done to bring a 1019 kg automobile traveling at 89 km/h to a stop?
J
A man pushes a lawn mower on a level lawn with a force of186 N. If 48% of this force is directed downward, how muchwork is done by the man in pushing the mower 5.3 m?
J

Explanation / Answer

a) The knietic energy is         K = (1/2)mv2 Here m = 1019 kg            v= 89 (5/18) m/s        b) According to work energy theorm ,we have      Work done = Cha nge in kineticenregy              W =  (1/2)m v2 - 0 Substitute the values. Here m = 1019 kg            v= 89 (5/18) m/s        b) According to work energy theorm ,we have      Work done = Cha nge in kineticenregy              W =  (1/2)m v2 - 0 Substitute the values.

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