Question

a 1500 kg truck traveling at 80 km/h collides with another car of mass 1000 kg traveling at 30 km/h in the same direction. The two
cars stick together after the collision. Their speed immediately after the collision will be
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Answer 1

Answer:

After collision speed will be 60km/h

Step-by-step explanation:

Truck

m1 = 1500 kg

u1 = 80 km / h

v1 = V

Car

m2 = 1000 kg

u2 = 30 km / h

v2 = V (Final Velocity of both Truck and car would be same as it is given in the question that they stick together after collision)

Now Applying Momentum Conservation

m1u1 + m2u2 = ( m1 + m2 ) V

1500×80 + 1000×30 = ( 1500+ 1000 ) V

120000 + 30000 = 2500 × V

150000 = 2500 × V

150000 / 2500 = V

V = 60 Km/ h

Ans - Speed afater collision will be 60 Km/h