A rocket, weighing 4.36 x 10 3kg, has an engine that provides an upward force of 1.2 x 105N. It reaches a maximum speed of 860 m/s. For how much time must the engine burn during the launch in order to reach this speed?

Chameleons catch insects with their tongues, which they can rapidly extend to great lengths. in a typical strike, the chameleon's tongue accelerates at a remarkable 220 m/s2 for 20 ms, then travels at constant speed for another 30 ms.