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Answer: Present perfect passive requires \'has/have been + past participle\'.
Answer: By mirror/lens formula 1/f = 1/v + 1/u → 1/10 = 1/v + 1/20 → v = 20 cm
Answer: a = F/m = 10/2 = 5 m/s²
Answer: Pressure = Force/Area, so SI unit is N/m² = Pascal (Pa)
Answer: \'Since\' is used with a specific day (Monday) as a starting point.
Answer: \'Tell the difference\' is the correct idiomatic expression.
Answer: KE = ½ mv² = ½ × 2 × 4² = ½ × 2 × 16 = 16 J
Answer: p = mv = 5 × 6 = 30 kg·m/s
Answer: Energy has the same unit as work, which is Joule (J)
Answer: f = v/λ = 340/2 = 170 Hz
Answer: \'As well as\' does not make the subject plural. The verb agrees with \'the teacher\' (singular).
Answer: W = mgh = 10 × 10 × 2 = 200 J
Answer: At the highest point of vertical motion, the instantaneous velocity becomes zero before the body starts falling down.
Answer: I = V/R = 20/5 = 4 A
Answer: a = v²/r = 100/5 = 20 m/s²
Answer: v = u + at = 0 + 2 × 5 = 10 m/s
Answer: Ohm\'s law states that the voltage across a conductor is directly proportional to the current flowing through it, V = IR.
Answer: Sound is a mechanical wave and requires a medium to propagate; it cannot travel through vacuum.
Answer: \'Doesn\'t\' is the correct negative form for third person singular.
Answer: 1/R = 1/4 + 1/6 = (3+2)/12 = 5/12 → R = 12/5 = 2.4 Ω