Question

Which would require a greater accelerating a 2kg mass at 5m/sec or 4kg mass at 2m/sec

Answer 1

4kg of s at 2m/s
...

Answer 2

$momentum \: in \: first \: case \: = mv \\ = 2 \times 5 \\ = 10n \\ momentum \: in \: scnd \: case = mv = \\ 4 \times 2 \\ = 8n \\ therefore \: case \: 2 \: requires \: a \: greater \: accleration$