A 3500kg truck moving rightward with a speed of 7km/hr collides head on with a 1200kg car moving leftward with a speed of 11 km/hr. The two vehicles stick together and move with the same velocity after the collision. Determine the post-collision velocity of the car and truck.

2.40 Km/hr.

Explanation:

From the question given above, the following data were obtained:

Mass of truck (m₁) = 3500 kg

Velocity of truck (u₁) = 7 Km/hr

Mass of car (m₂) = 1200 kg

Velocity of car (u₂) = 11 km/hr

Post collision velocity (v) =?

The post collision velocity of the truck and car can be obtained as illustrated below:

m₁u₁ – m₂u₂ = v(m₁ + m₂)

(3500 × 7) – (1200 × 11) = v(3500 + 1200)

24500 – 13200 = v × 4700

11300 = v × 4700

Divide both side by 4700

v = 11300 / 4700

v = 2.40 Km/hr.

Therefore, the post collision velocity of the truck and car is 2.40 Km/hr.

the total distance traveled by the car is

30km + 49km = 79 km .

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.