m=1200kg, V1= 10ms−1 V2 = 15ms−1, w= ?
work=►K.E = K.E2 = K.E2 - K.E1 ⇒work= 12mv22−12mv12 ⇒work= 12m(v22−v12) ⇒work= 12×1200×(152−102) ⇒work = 600 × (225 -100) ⇒work= 600 × 125 ⇒work= 7.5×104j
