[填空题]
1.State the difference between distance and displacement.
2.A dart player throws a dart horizontally with the speed of $5\,m\,s^{−1}$ to hit a dartboard. The vertical displacement of the dart is $0.35\,m$. Air resistance is negligible.
(1)Show that the time taken for the dart to reach the centre of the dartboard is approximately 0.3 s. t = s
(2)Calculate the angle to the horizontal, in degrees, of the velocity of the dart as it hits the dartboard. θ = $^{\circ}C$
(3)Determine the displacement of the dart. s = m
(4)On the axes below, sketch how the square of the velocity $v^2$ of the dart varies with the square of time $t^2$.
(no need to add values on the axes)
