The position vector of a particle related to time $t$ is given by
$$
\overrightarrow{\mathrm{r}}=\left(10 t \hat{\mathrm{i}}+15 t^2 \hat{\mathrm{j}}+7 \hat{\mathrm{k}}\right) \mathrm{m}
$$
The direction of net force experienced by the particle is:
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