The velocities of a body moving along a straight line with a constant acceleration are 10m/s at t=4s and 20m/s at t=9s. The velocity of athe body at t=1s is

Q. The velocity V of a body moving along a straight line varies with time $t$ as $v=2t^2{e}^{-t}$, where v is in m/s and $t$ in second . The acceleration of body is zero at $t$=

Q. A body starts with some initial velocity along a straight line. After $3s$ it is found to be at a distance of $15m$ from the starting point. At $4s$ it is at starting point. What is the initial velocity of the body? Assume constant acceleration.

Q. A body starts from rest and moves along a straight line. It is uniformly accelerated at a rate of 2 m/s' for lOs. For next 20 sec., the body moves with uniform velocity.Then a negative acceleration of 2 m/s acts on the body till the body comes to rest again. Draw velocity-time graph for entire motion.

Q. A body initially at rest starts moving with a constant acceleration $2m{s}^{-2}$. Calculate the velocity acquired in 5 s.