How much net work is required to accelerate a 1200 kg car...
How much net work is required to accelerate a 1200 kg car from 10ms−1 to 15ms−1
1.95×105j
1.35×104j
7.5×104j
6.0×104j
Correct answer is C
m=1200kg, V1= 10ms−1 V2 = 15ms−1, w= ?
work=►K.E = K.E2 = K.E2 - K.E1
⇒work= 12mv22−12mv21
⇒work= 12m(v22−v21)
⇒work= 12×1200×(152−102)
⇒work = 600 × (225 -100)
⇒work= 600 × 125
⇒work= 7.5×104j
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