A car is moving on a horizontal surface in a straight line with a constant velocity of $3 \mathrm{~m} / \mathrm{s}$. A ball is thrown vertically upwards at time $t=0$ from the top of the moving car with a velocity of $20 \mathrm{~m} / \mathrm{s}$. The acceleration due to gravity is $10 \mathrm{~m} / \mathrm{s}^{2}$.
At what value(s) of time $t$ in second(s), the ball is at a height of $15$ $\mathrm{m}$ from the top of the moving car?
- $1$
- $2$
- $3$
- $4$
