An automobile eng

Mass of the car = 1000 Kg

Speed, V = 36 km/hr = (36 x 1000)/3600 = 10 m/s

Frictional force, k = 100 N

Power = k. V = 100 x 10 = 1000W

After collision of both the cars, according to law of conservation of momentum,

m_Au_A + m_Bu_B = m_Av_A + m_Bv_B

⇒ 1000 x 10 + 1000 x 0 = 1000 x 0 + 1000 x v_B

⇒ v_B = 10m/s

Therefore, the speed of the car (B) just after the collision is 10m/s.