Physics

Problem

Calculate the acceleration in the following situations: a. A boy walking along the road changes his speed from

0.6 \text{ ms}^{-1}

1.2 \text{ ms}^{-1}

in a time of 1 minute. b. The velocity of an electron changes from

0.0 \text{ ms}^{-1}

2 \times 10^7 \text{ ms}^{-1}

in a time of 4.0 ns. c. An aeroplane approaching an airport changes its speed from

90 \text{ ms}^{-1}

30 \text{ ms}^{-1}

in a time of 20 minutes.