Two identical disks

PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

Two identical disks, each of mass

m

, slide on a frictionless horizontal surface. Disk 1 moves east at

3.0\,\text{m/s}

, and Disk 2 moves north at

4.0\,\text{m/s}

. The disks collide and stick together. What percent of the system’s kinetic energy is lost in the collision? (a)

75\%

(b)

0\%

(c)

50\%

(d)

32\%