Give 2 reasons for fitting heavy commercial vehicles with many tyres​

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

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.

What are two different ways you could find the value of a? explain these methods.