Can someone help me with this
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8/3 m/s² or 2.67m/s²

Explanation:

According to the second Law of Newton, the acceleration of an object is directly related to the net force and inversely related to its mass. This can be translated in a mathematical equation:

a= F/m

a=4000N/1500kg

a=8/3m/s²

or in decimal form

2.67m/s²

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.