Question

(dT/du)(du/dv)(dv/dt)=-1 want to know about this formula​

Answer 1

"d" means very very small

for instantaneous velocity,

v = ds/dt (very short distance within a short period of time)

For instantaneous acceleration,

As the distance is very very small , the change of velocity doesn't happens.

Velocity is constant in this case

a = dv/dt