What is the period of a wave with a wavelength of 8 cm and a frequency of 0.5 hertz? A. 2 seconds
B. 0.125 seconds
C.0.0625 seconds
D. 4 seconds . (I think it's D).

{ cmmt if you want to be added to a Physics B connections acay ig gc}

Aprojectile is launched horizontally 10m above the ground and with an initial velocity of 15 m/s. a) determine the magnitude and direction of projectile velocity at t= 1.3s b) determine the magnitude and direction of projectile acceleration at t=1.3s

An airplane flies eastward and always accelerates at a constant rate. at one position along its path it has a velocity of 34.3 m/s, it then flies a further distance of 40100 m and afterwards its velocity is 47.5 m/s. find the airplane\'s acceleration and calculate how much time elapses while the airplane covers those 40100 m.

Can anybody me with this? ? (picture included.)