If a bus travel 200 km in 45 minutes calculate the speed in kilometre per minute

Aparticle initially moving east with a speed of 20.0 m/s, experiences an acceleration of 3.95 m/s, north for a time of 8.00 s. what was the speed of the particle after this acceleration, in units of m/s? give the answer as a positive number.

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

In science and physics what is the standard unit of measure for speed?