Question

Determine the average velocity of the cart and disk as they move together during a 24-frame interval after the collision. Use the blue dot on the left end of the cart as the point of reference for your measurement?

Answer 1

The answer is 38.7 kg·m/s

Explanation:

Considering the definition of average velocity,

The average speed of an object is defined as the distance traveled divided by the time elapsed.

Therefore, If in the frame of 320, the blue dot appears to be at 0 cm and 24 frames later (at 344), the blue dot appears to be at 11 cm. 24 frames is 1/10 of a second, so

V = 11cm / 0.10s = 110 cm/s = 1.10 m/s

give or take.

Bonus: initial system (cart only) momentum

p = mv = 23.8kg * 1.80m/s = 42.8 kg·m/s

final system (cart+disk) momentum

p = (23.8+11.4)kg * 1.10m/s = 38.7 kg·m/s