A Train starts from rest and attains a velocity of 45 km.p.h in 2 minutes with uniform acceleration. Calculate distance travelled in 2 minutes
Answers
Answer:
Examples of different speeds
Speed m/s ft/s
A typical road cyclist 4.4 14.4
A fast martial arts kick 7.7 25.2
Sprint runners 12.2 40
Approximate average speed of road cyclists 12.5 41.0
Explanation:
Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour or, in the US and the UK, miles per hour. For air and marine travel the knot is commonly used.
The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in a vacuum c = 299792458 metres per second (approximately 1079000000 km/h or 671000000 mph). Matter cannot quite reach the speed of light, as this would require an infinite amount of energy. In relativity physics, the concept of rapidity replaces the classical idea of speed.
2mins= (2/60)hr= 1/30hr
a=( v-u) /t
= 45-0 /(1/30)= 45×30= 1350kmph²
v²-u²= 2as
s= (v²-u²)/2a
s= (45)²- (0)²/ 2×1350
s= 45/2750
s= 0.0163 km(Ans)