physics
posted by parul .
a body moves with a uniform velocity of 2m/sec for 5 sec then velocity was uniformly accelerated and a velocity of 10m/sec was achieved in next 5 sec.then brakes were applied uniformly and body comes to rest in next 10 sec.calculate
a)acceleration and retardation produced
b)distance moved by the body with uniform velocity
c)different distances moved by the body with nonuniform velocity i.e.when acceleration was active
d)average velocity in whole journey

s1=v1•t1 =2•5 =10 m.
v2=v1+a1•t2 .
a1 =(v2v1)/t2 =( 105)/5 = 1m/s².
s2 = v1•t2 + a1•t2²/2 =5•5+1•25/2 =37.5 m.
0 =v2+a2•t3,
a2 =(0v2)/t3 = 10/10 =1 m/s².
s3 = v2•t3 – a2•t3²/2 =10•101•100/2 =50 m
v(ave_ =s/t =(s1+s2+s3)/(t1+t2+t3) =
(10+37.5+50)/(5+5+10) = 97.5/20 =4.875 m/s
Respond to this Question
Similar Questions

physics
a body is moving with a velocity 96m/s is to be brought to rest in the 16 sec find displacement of body before it comes to rest and also find velocity after 10 th sec 
physics
A cyclist is cycling at uniform velocity of 8m/sec for 8 sec then applies brakes and cycle come to rest in next 10 sec. calculate a)Distance traveled by uniform velocity. b)distance traveled by nonuniform velocity c)total distance … 
physics
a car traveled at uniform velocity of 20m/sec for 5 sec the brakes are applied and car retards uniformly and come to rest in further 8 sec.find a)distance traveled in first five sec b)distance traveled after breaks are applied c)total … 
physics
a cyclist start from rest and accelerate uniformly to achieve a velocity of 12m/sec in 5 sec.immediately he applied brake and come to rest in next 4 sec .calculate a)distance traveled during acceleration b)distance traveled during … 
physics
a train starts from rest and accelerates uniformly to achieve a velocity of 20m/sec in 10 sec.then train maintains this speed for next 200 sec.the breaks are then applied and train comes to rest in next 50 sec.calculate a)acceleration … 
physics
a train starts from rest and accelerates uniformly to achieve a velocity of 20m/sec in 10 sec.then train maintains this speed for next 200 sec.the breaks are then applied and train comes to rest in next 50 sec.calculate a)acceleration … 
physics
a train starts from rest and accelerates uniformly to achieve a velocity of 20m/sec in 10 sec.then train maintains this speed for next 200 sec.the breaks are then applied and train comes to rest in next 50 sec.calculate a)acceleration … 
science/ velocity
a body moves along a straight line,its distance from the origin at any instant being given by the equation x= 8t 3t squared, where x is in centimeter and t is in seconds. find the average velocity of the body in the interval from … 
physics
a car starts from rest and attains a velocity of meter/sec,then acceleration changes and it aquires the velocity of 20meter/sec in next 5sec .then it slows down and comes to rest in next 5sec.draw a velocitytime graph for the given … 
physics
the velocity of a body moving with uniform acceleration is 10m/s at a particular instant. its velocity after 5 sec is 20m/s. what was the velocity of the body 3 sec before that instant?