Q 11 :

A person travelling on a straight line moves with a uniform velocity $v_1$ for a distance x and with a uniform velocity $v_2$ for the next $\frac{3}{2}x$ distance. The average velocity in this motion is $\frac{50}{7}$ m/s. If $v_1$ is 5 m/s then $v_2$ = __________ m/s.          [2025]

Q 12 :

The distance travelled by a particle is related to time t as $x=4t^2$. The velocity of the particle at t = 5 s is                   [2023]

• 8 ${\mathrm{ms}}^{-1}$

   

• 20 ${\mathrm{ms}}^{-1}$

   

• 25 ${\mathrm{ms}}^{-1}$

   

• 40 ${\mathrm{ms}}^{-1}$

   

Q 13 :

A vehicle travels 4 km with speed of 3 km/h and another 4 km with speed of 5 km/h, then its average speed is           [2023]

• 4.25 km/h

   

• 3.50 km/h

   

• 4.00 km/h

   

• 3.75 km/h