Which of the following are units of velocity?
Lightyear
Angstrom
Parsec
Knots
A knot is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.151mph.
Lightyear and parsec and angstrom are units of length.
The unit of time is :
(a) light year (b) parsec
(c) leap year (d) angstrom.