A car with a mass of 1.1 * 103 kilograms hits a stationary truck with a mass of 2.3 * 103 kilograms from the rear end. The initial velocity of the car is + 22.0 meters/second. After the collision the velocity of the car is - 11.0 meters/second. What is the velocity of the truck after this elastic collision?

A.+13 meters/second

B.+20 meters/second

C.+15.7 meters/second

D.+7.5 meters/second

E.+9.8 meters/second

Question

Chemistry

Guest

25 March, 16:03

A car with a mass of 1.1 * 103 kilograms hits a stationary truck with a mass of 2.3 * 103 kilograms from the rear end. The initial velocity of the car is + 22.0 meters/second. After the collision the velocity of the car is - 11.0 meters/second. What is the velocity of the truck after this elastic collision?

A.+13 meters/second

B.+20 meters/second

C.+15.7 meters/second

D.+7.5 meters/second

E.+9.8 meters/second

+4

Answers (1)

Know the Answer?

Josue Allison · Answer 1

The answer is C : 15.7 m/s

Use the idea of : momentum before collision = momentum after collision

Before collision;

For car:mass=1.1*10^3, velocity=22

For truck:mass=2.3*10^3, velocity=0

After collision;

For car:mass=2.3*10^3, velocity=-11

For truck:mass=2.3*10^3, velocity=V

(1.1*10^3 * 22) + (2.3*10^3 * 0) = (1.1*10^3 * - 11) + (2.3*10^3 * V)

24200 = - 12100 + 2.3*10^3V

2.3*10^3V = 36300

V = 15.7 m/s