Question

plz choose 1 correct ans . and also explain it .also tell this question is meant for which class?

Answer 1

opt b is correct..
for this you need to have the concept of slope..that is in class 11.
firstly distance can vary at a single instance of time.so graph 3 is incorrect.then secondly in graph 1 at every point the tangent's angle is different i.e dy/dx(slope) changes that means speed is variable.third in graph 2 the tangent at every point us constant i.e dy/dx is constamt .hence the speed is constant.. it's actually for the class 11.I think so