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Post a LessonAnswered on 15/09/2018 Learn Motion in a Straight Line
Mandeep Kaur
Answered on 14/09/2018 Learn Motion in a Straight Line
Rohit Agnihotri
Professional Teacher
Answered on 14/09/2018 Learn Motion in a Straight Line
Abhishek Aman
Tutor
Both are in opposite direction,so consider one velocity in negative direction.
Velocity of jet w.r.t. ground Vjg= 500 km/h …...(Upward)
Velocity of products relative to jet VPJ = 1500 km/h …(downward)
Hence, velocity of products relative to ground = -1500+500
= -1000 km/h
Here – ve sign means downward .
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Answered on 18/09/2018 Learn Motion in a Straight Line
Ayush Chaturvedi
Ayush
Answered on 15/09/2018 Learn Motion in a Straight Line
Vijay Giri
Tutor
Answered on 14/09/2018 Learn Motion in a Straight Line
Ambika Seetharaman
Tutor
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Answered on 14/09/2018 Learn Motion in a Straight Line
Anurag Mohapatra
Tutor
Speed of the belt, vB = 4 km/h
Speed of the boy, vb = 9 km/h
Since the boy is running in the same direction of the motion of the belt, his speed (as observed by the stationary observer) can be obtained as:
vbB = vb + vB = 9 + 4 = 13 km/h
Since the boy is running in the direction opposite to the direction of the motion of the belt, his speed (as observed by the stationary observer) can be obtained as:
vbB = vb + (-vB) = 9 – 4 = 5 km/h
Distance between the child’s parents = 50 m
As both parents are standing on the moving belt, the speed of the child in either direction as observed by the parents will remain the same i.e., 9 km/h = 2.5 m/s.
Hence, the time taken by the child to move towards one of his parents is .
If the motion is viewed by any one of the parents, answers obtained in (a) and (b) get altered. This is because the child and his parents are standing on the same belt and hence, are equally affected by the motion of the belt. Therefore, for both parents (irrespective of the direction of motion) the speed of the child remains the same i.e., 9 km/h.
For this reason, it can be concluded that the time taken by the child to reach any one of his parents remains unaltered.
read lessAnswered on 03/12/2018 Learn Motion in a Straight Line
Rajeshwari Mohanarangam
Home Tutor
Asked on 14/09/2018 Learn Motion in a Straight Line
A car moving along a straight highway with speed of 126 km h-1 is brought to a stop within a distance of 200 m. What is the retardation of the car (assumed uniform), and how long does it take for the car to stop?
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Asked on 14/09/2018 Learn Motion in a Straight Line
A police van moving on a highway with a speed of 30 km h-1 fires a bullet at a thief s car speeding away in the same direction with a speed of 192 km h-1 . If the muzzle speed of the bullet is 150 ms-1 , with what speed does the bullet hit the thief s car? (Note: Obtain that speed which is relevant for damaging the thief s car).
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