A vehicle travels half the distance L with speed V₁ and the other half with speed V₂, then its average speed is

(a) $\frac{{\mathit{V}}_1+{\mathit{V}}_2}{2}$

(b) $\frac{2{\mathit{v}}_1+{\mathit{v}}_2}{{\mathit{v}}_{1+}{\mathit{v}}_2}$

(c) $\frac{2{\mathit{v}}_1{\mathit{v}}_2}{{\mathit{v}}_{1+}{\mathit{v}}_2}$  

(d) $\frac{\mathit{L}({\mathit{v}}_1+{\mathit{v}}_2)}{{\mathit{v}}_1{\mathit{v}}_2}$

Two trains 101 m and 99 m in length are running in opposite direction with velocities 54 km/h and 36 km/h. In what time they will completely cross each other?

Distance travelled by a particle starting form rest and moving with an acceleration of 4/3ms^-2 in the second is

Match List – I with List – II :

List – I                                                                               List – II

(a) h (Planck’s constant)                                               (i) $\left[ML{T}^{-1}\right]$  

(b) E (kinetic energy)                                                     (ii) $\left[M{L}^2{T}^{-1}\right]$        

(c) V (electric potential)                                                (iii) $\left[M{L}^2{T}^{-2}\right]$  

(d) P (linear momentum)                                             (iv) $\left[M{L}^2{I}^{-1}{T}^{-3}\right]$  

Choose the correct answer from the options given below:

A small toy starts moving from the position of rest under a constant acceleration. If it travels a distance of 10m in t s, the distance travelled by the toy in the next t s will be:

A vehicle travels half the distance with speed  $\mathrm{v}$ and the remaining distance with speed $2\mathrm{v}$ . Its average speed is:
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