Question

1. Which of the following is incorrect
a) Basic unit of speed is m's
b) The slope of the distance time of moving object represent speed
of the objects
c) if the distance travelled by car is 10 km in 2 hr. its average speed
is 20 kmh
d) Abus travels 54 km in 90 minutes. The speed of the bus is 10
mis
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Answer 1

Answer:

(i) The basic unit of time is second – Correct

(ii) Every object moves with a constant speed - Not correct

(iii) Distances between two cities are measured in kilometers – Correct

(iv) The time period of a given pendulum is not constant - Not correct

(v) The speed of a train is expressed in m/h - Not correct