A truck pulls a trailer from a standstill with a constant force. After 2 minutes, the truck is moving at 48 km/hr. If the same truck applies the same constant force to pull a second trailer which is 3 times the mass of the first trailer, how fast will the truck be moving after 2 minutes? A. 24 km/hr B. 16 km/hr C. 8 km/hr D. 64 km/hr
