Question

Two balls of masses m and 2m are moving with uniform velocity 4v and v compare the force needed to stop them in same time
For help I gave the answer-2:1

Answer 1

first ball
the force is equal to 4 Mv
for second ball
force is equal to 2 Mv
the ratio is equal to 2 : 1

Answer 2

force= m*v
: case 1
m= m and v=4v
f1 = 4N
: case 2
m= 2m and v= v
f2 = 2N
ratio of f1/f2 = 4N/2N
= 2:1