Light gates are more reliable. When using a manual stop watch, it is difficult to stop it at an exact time. A light gate is able to detect when an object passes through a 'gate' with the infrared transmitter and receiver.
Answer:
Its not A..
Explanation:
I chose A - was incorrect
Power = Work done/Time taken
So, keeping this in mind,we can solve it as follows:
= 700/3.1
= 7000/31
= 225.80 W
3 hours, because for every 50 km equals one hour 150 divided into 50 equals 3
