Question

how much force is needed to stop a 90-kg soccer player if he decelerates at 15 m/s2 A. 15 N B. 1350 N C. 6 N D. 135 N

Answer 1

Force is the product mass versus aceleretion. Well, in this case, we need a force that be able to decelerate 90kg at 15m/s², then:

\[F =m \times a\]
\[F=90kg \times 15\frac{ m }{ s³ }\]
\[F=1350 N\]

Alternative "B" is correct.