Deja Vu

If u=secx+tanx-1,v=secx-tanx+1," then "u'v+v'u=

A car moves from X to Y with a uniform speed v_u and returns to Y with a uniform speed v_d . The average speed for this round trip is :

Find the next term in the following series. 24XW23, 22VU21, ________?

The velocity of the particle at any time t is given by vu = 2t(3 - t) m s^(-1) . At what time is its velocity maximum?

Select the related letters/words/number from the given alternatives. AB : ZY : : CD : ? 1) WX 2) UV 3) XW 4) VU

A body of mass m is travelling with a velocity vu. When a constant retarding force F is applied, it comes to rest after travelling a distance s_(1) . If the initial velocity is 2u with the same force F, the distance travelled before it comes to rest is s_(2) . then,