A. Linear momentum is the amount of motion contained in a moving body. Mathematically, linear momentum is simply the product of the mass of a body and its velocity.

Linear momentum(p)=mass(m)× velocity(v)

The dimensions of p are the dimensions of m× v

Dimensions of m = [ M]

Dimensions of v

Dimensions of mv=[M]× [LT^-1] = [MLT^-1]

Hence the dimensions of linear momentum are [MLT^-1].

B. Frequency is defined as the reciprocal of time period.

Dimensions of t = [T¹]

Dimensions of f = .

C. Pressure is defined as force per unit area acting normally to the area.

Dimensions of F = [MLT^-2]

Dimensions of A = [L²]

Dimensions of P = .