A car moves with a speed of 30 km/hr. What will be the speed of the same car measured by a speed sensor which is placed in a truck which is moving with a speed of 20 km/hr in the same direction?

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Sensors and Transducers topics include: Transducers types, characteristic parameters, static and dynamic characteristics. This section also covers questions on sensors like displacement sensor, position sensor, proximity sensor, motion sensor, velocity, force, acceralation, torque, fluid pressure and liquid flow sensors. Sensors and transducers are both electronic devices that measure or detect physical processes and phenomena.  Here are some differences between sensors and transducers: Sensors: Detect and respond to a specific input, such as light, temperature, pressure, or motion.... Show more

A car moves with a speed of 30 km/hr. What will be the speed of the same car measured by a speed sensor which is placed in a truck which is moving with a speed of 20 km/hr in the same direction?