The unit of work is called derived unit. Why

Modify the equation fδt=δ (mv) to find the force of friction.

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s. t.p.?