Question

according to this equation f equals Ma how much force is needed to accelerate a 70 kg runner at 5 m/s^2.

Answer 1

ANSWER
The required force is
$350N$

EXPLANATION

The force needed to accelerate a 70kg runner at $5ms^{-2}$ is the product of the mass of the runner in kilograms and the acceleration in meters per seconds square.

The equation is given by,

$F=ma$

where

$m = 70kg$
and

$a=5m{s}^{-2}$

This implies that,

$F=70\times 5N$

We multiply to get,

$F=350N$

Therefore the needed force is 350 Newtons.