Solution:
a) v = 300 km/h
In meter per second
=> v = 300 * 1000 m / 60 * 60 sec
=> v = 83.33 m/s
In miles per hour
and , v = 300 km/h
=> v = 300 * 0.62137 miles / h
=> v = 186.4 miles/h
b) p = 998 kg / m^3
=> p = 998 * 1000 / 10^6
=> p = 998 * 10^-3 g / cm^3
=> p = 0.998 g / cm^3
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