Question

the brakes of a 1000 kg ambulance truck exert 2500N . how long will it come to stop from a velocity of 25 m/s?​

Answer 1

given:

mass - 1000kg

force - 2500N

velocity - 25m/s

to find : time to stop

Explanation:

we will use the first equation of motion to solve this question.

v = u + at

where v is final velocity

u is initial velocity

a is the acceleration

t is time taken

According to the question, v = 0   u = 25m/s

acceleration can be found by F = m*a  

acceleration = 2500N/1000

                     = 2.5 metre per second square.

putting in the equation to find time

0=25-2.5(t)       [minus sign because its deacceleration]

-25 = -2.5(t)

t=10 seconds

HENCE, IT WILL TAKE 10 SECONDS TO STOP.