Question

A motor car moving with a uniform speef of 20m/s comes to rest on the application of brake after travelling a distance of 10 m. Find its accelaration​

Answer 1

Answer:

a = - 20 m/s²

Explanation:

initial velocity = u = 20 m/s

distance = d = 10 m

2as = v²-u²

a = v²-u²/2s

a = (0)²-(20)²/2*10

a = 0-400/20

a = - 400/20

a = - 20 m/s²    

negative acceleration denotes deceleration.