Q 20 & 21 pls experts ans it fast

Q 20 & 21 pls experts ans it fast 20. or by — —sin — sin — — Wb ere a maximum displacement, v velocity. "me, Sionany true ? (A) (i) and (ii) arc wrong (C) (iii) and (iv) are wrong (B) and (iii) are wrong (D) (iv) and arc wrong r 21. 22. I r dimension or (A) and (B) are different then which or be 'rue ? Which or the following statement is dimensionally true (A) Pressure is an energy per unit area. (B) Pressure is an energy per unit volume. (C) Pressure is a force per unit volume (D) Pressure is a momentum per unit yolume per unit time, Where S is (surface tension •r he dimensional formula Of — M'l.mru