1. The acceleration equation of a certain particle is a=2t, after 4s, its velocity reaches 20m/s, then the initial velocity of the particle movement is ) ms B Sms 2.

Change in velocity is the integral of all the differential accelerations acting over the period of acceleration.

20 = u + t²

20 = u + 4² - 0²

20 = u + 16

u = 4 m/s

explanation:

a fuel engine ( known as a gasoline engine in american english )is an internal combustion engine with spark ignition, designed to run on petrol (gasoline) and similar volatile fuels.