a motorcycle is moving with a velocity of 90km/h and it takes 5s to stop after applied brake calculate force exerted by the brakes on the motorcycle if it's mass along with the rider is 200kg
Answers
Answered by
6
90km/h=90*1000/60*60=25m/s
using first equation of motion
v=u+at
0=25+a*5
a=-5m/s^2
so
f=mass×acceleration
F=200×5=1000N
pls mark brainleist
using first equation of motion
v=u+at
0=25+a*5
a=-5m/s^2
so
f=mass×acceleration
F=200×5=1000N
pls mark brainleist
hidivyanshp4f9il:
yup but we know its retarding force which direction does negative sign indicate if we are using vector form we should write icap j cap or k cap
its sufficient
please give me a fix answer negative one or positive
if u are writing without negative sign mention that its opposite in direction of motion
okk
actually we always know force exerted by breaks will always be opposing
Yeh
again thanks
no
prob
Answered by
11
Hello,
Time taken to stop = 5 seconds
Initial velocity = 90 km/hr = 25 m/sec
Final velocity = 0 m/sec ( since, body stopped after 5 seconds)
So,
Acceleration =final velocity - initial velocity ÷time taken
So,
Acceleration = 0-25/5 = (- 5)m/sec²
Now, acceleration in negative means retardation.
Now
From newton's second law of motion
Force = mass *acceleration
Force = 200 *( - 5) = (-1000)N
Force in negative means that the force is applied in opposite direction of motion.
Hope this will be helping you
WARM REGARDS
Sahil khirwal
Time taken to stop = 5 seconds
Initial velocity = 90 km/hr = 25 m/sec
Final velocity = 0 m/sec ( since, body stopped after 5 seconds)
So,
Acceleration =final velocity - initial velocity ÷time taken
So,
Acceleration = 0-25/5 = (- 5)m/sec²
Now, acceleration in negative means retardation.
Now
From newton's second law of motion
Force = mass *acceleration
Force = 200 *( - 5) = (-1000)N
Force in negative means that the force is applied in opposite direction of motion.
Hope this will be helping you
WARM REGARDS
Sahil khirwal
thanks alot
welcome ✌️
Similar questions