A projectile is fired at 398 mi/hr. How fast is that in meters per second, to the nearest whole value? Use the conversion factor 1 mile = 1610 m.

Answer 1

398(1610)/3600

= 398(161)/360

=177.99444.... = almost 178 meters per second

1 hour = 60(60)= 3600 seconds

1 mile = exactly 1609.344 meters

1 inch = exactly 2.54 cm

12 inches = 1 foot = 12(2.54) = 30.48 cm = .3048 meters

1 mile = 5280 feet = 5280(.3048) = 1609.44 meters

398(1609.44)/3600 = exactly 177.92192 meters per second