Question

Please tell me how to do thisno.51

Answer 1

Answer:

use the formula v=u+at

v=0 since finally the car came to rest

u=10 since the car Is travelling with that speed

therefore,

-u=at

given=20

=-u=a×20

-10=a×20

a=-10/20

a=-0.5

acceleration is always positive ,we got negative that is that means if acceleration is negative we call it retardation if they asked what is acceleration answer is -0.5m/'s but they asked retardation so it is +0.5m/s