1 ) the mass of medicine in a tablet is 350mg.

Express this nass in SI units ?

350 X 10 ^4 = 3500000

2) the compnents of a vectory are of equal magnitude if the angle between the vectory and X-axis is .................. . (zero )

3 ) A ball is thrown directly downward with an initial speed of 10 m/s , from a height of 50 m .

After what interval dose the ball strike the ground ?

V0 = 10 Dx = -50 with (-) becuse downward

Dy = v0t + 1/2 gt^2

-50=-10t+1/2X-9.8Xt^2

t = 2.23