Sound waves travel faster
Answer:
72 km/h
Explanation:
Speed of car = 20m/s
So, here to find the speed in km/h we will change the metre to km and seconds to hours .
=>

= 72 km/hr
to change into km divide by 1000
(1 m = 1/1000km)
and,
to change into hours divide by 60*60= 3600
help kiya kya?
Answer:
C. 100
D.3
E. 33.3
Explanation:
C. Mechanical Advantage=Load / Effort
= 200N
--------
100N
Therefore,. = 100
D. I. Velocity Ratio= distance moved by the effort / distance moved by load
= 30cm/10cm
= 3
II. Efficiency= M.A / V.R
= 100/3
= 33.33