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Answer :

DᴀʀᴋPᴀʀᴀᴅᴏxgo

let's find the acceleration first :

  • [tex] \boxed{a = \frac{v - u}{t} }[/tex]

  • [tex]a = \dfrac{30 - 20}{2} [/tex]

  • [tex]a = \dfrac{10}{2} [/tex]

  • [tex]a = 5 \: \: ms {}^{ - 2} [/tex]

now, we know that :

  • [tex]f orce= mass \times acceleration[/tex]

  • [tex]30 = m \times 5[/tex]

  • [tex]m = \dfrac{30}{5} [/tex]

  • [tex]m = 6 \: \: kg[/tex]

hence, mass = 6kg

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