Respuesta :
[tex]\huge\underline\bold\blue{ƛƝƧƜЄƦ}[/tex]
In first case
[tex]\green\star[/tex]m = 1200 kg
[tex]\blue\star[/tex]force exerted by first student and second student = 200N+250N
[tex]\green\star[/tex]a = ?
[tex]\blue\star[/tex]F = m×a
[tex]\green\star[/tex]200N + 250 = 1200kg × a
[tex]\blue\star[/tex]a = [tex]\dfrac{450}{1200}[/tex]
[tex]\green\star[/tex]a = 0.375 m\s
Hope it helps.