Question

Which one requires greater force:(i) to generate motion of a body of mass 'm' from 0 to 'v' in time 't'; or (ii) to generate motion of a body of mass '2m' from 0to '2v' in time '4t'.

Answer 1

Answer:

both will utilise equal force

Step-by-step explanation:

we know that a = (v-u)/t

and F = ma

in case 1, a = v/t

thus F = mv/t

in case 2, a = 2v/4t = v/2t

thus F = 2m.v/2t = mv/t