# A ball is dropped from a height of 45m above the ground. Calculate the...

Question 464
A
21.2$$ms^{-1}$$
B
30$$ms^{-1}$$
C
300$$ms^{-1}$$
D
450$$ms^{-1}$$
E
900$$ms^{-1}$$
##### Explanation
$$v^2 = u^2+2as=0^2 + 2\times 10\times 45 \Rightarrow v^2 = 900m^2s^{-2} \Rightarrow \\ v = \sqrt{900m^2s^{-2}} \Rightarrow v = 30ms^{-1}$$

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