A caterpillar crawling up a leaf slows from 0.75 cm/s to 0.50 cm/s at a rate of -0.060 cm/s^2. How long does it take the caterpillar to make the change?

An electron moving at 5.06 103 m/s in a 1.23 t magnetic field experiences a magnetic force of 1.40 10-16 n. what angle does the velocity of the electron make with the magnetic field? there are two answers between 0° and 180°. (enter your answers from smallest to largest.)