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4) d) four 5) a) ...
4) u = 1.8 m/s
s = 0.2
n = no of steps
s(y axis ) = ut + 1/2 at²
sy = 0 + 1/2(10)t²
(0.2)n = 5t²
t = √1/25n
t = √ 0.04n
t = 0.2√n
s( x axis ) = ut
0.2n = 1.8 × 0.2√n
0.04 n²= 3.24 × 0.04 n
0.04n² - (0.04n × 3.24 ) = 0
(0.04 n) ( n - 3.24) = 0 => factors
0.04n = 0
n = 0 --> option not there
n - 3.24 = 0
n = 3.24 ---> 4 (app)
5) the first ball is thrown up wards so the height will be more so, v directly proportional to h . second is thrown straightly so finally
v1>V2>v3 ..:) plz mark as BRANIEST !!