Question

The unit of linear momentum cannot be

• A. $kgm{s}^{–1}$
• B. $N{s}^{–1}$
• C. $Ns$
• D. $gcm{s}^{–1}$

Answer 1

The correct option is B $N{s}^{–1}$

Linear momentum of an object of mass m moving with velocity v is given by
p = mv
Unit of $p=kgm{s}^{–1}$
The SI unit of momentum is $kgm{s}^{–1}$ and the CGS unit of momentum is $gcm{s}^{–1}$
According to Newton’s second law of motion:
Rate of change of momentum is called force i.e., $F=\frac{\Delta p}{t}$
$\Rightarrow \Delta p=F\times t$
$\Rightarrow$ Unit of p = N-s
Hence, the correct answer is option (2).