Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

ICSE Class 9 Answered

A truck running at 72 km/h is brought to rest over a distance of 25 m.Calculate the retardation and time for which brakes are applied ?
Asked by nishola82 | 22 May, 2018, 23:44: PM
answered-by-expert Expert Answer
Initial speed = 72 km/h = 72×(5/18) = 20 m/s.
 
to get reatardtaion, equation to be used is " v2 = u2 - 2×a×S " ,
where v is final speed ( v=0 here ), u is initial speed, a is retardation and S is distance travelled
 
hence retardation a = (20×20) / (2×25) = 8 m/s2
 
time t is obtained using equation " v = u - a×t ", with v = 0 
 
hence time t = 20/8 = 2.5 s
Answered by Thiyagarajan K | 23 May, 2018, 12:32: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
ICSE 9 - Physics
At sea level atmospheric pressure is 76cm of hgif air pressure falls by 10mm of hg 120m of ascent what is the height of a hill where barometer r4ads 70 cm hg state the assumption made by you
Asked by pinaloswal1 | 13 Jul, 2024, 19:03: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Physics
teacher I cannot understand the concept of graphs in physics chapter 1 and 2
Asked by 2016159 | 12 Jul, 2024, 16:20: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Physics
Saving account deposit and interest calculation recurring deposit amount and interest calculation on maturity. please experts it's the question of maths but i have to askk here because it's really urgent!! can u pls tell me the contents to include in this project
Asked by 2016159 | 26 Jun, 2024, 19:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Physics
how can i download notes
Asked by 2016159 | 13 Jun, 2024, 23:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Physics
hydrometer
Asked by kavyavishwa3469 | 04 Jun, 2024, 17:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Physics
What will be the effect of the time period of a seconds pendulum if the pendulum is taken on the surface of the moon knowing that gravity is 1/6 of that of the Earth
Asked by naitikv632009 | 03 Jun, 2024, 07:20: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Physics
what is the basic difference between the positive zero error and the negative zero error of the vernier scale then of the positive zero error and the negative zero error of the s crew gauge
Asked by 2016159 | 29 May, 2024, 19:50: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Physics
why it is said that if this main scale zero mark is going between the mark 0 and 1 of the vernier scale why is it said that it is in negative zero error and what is the difference between the positive error and the negative error
Asked by 2016159 | 29 May, 2024, 19:48: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Physics
how is a physical quantity expressed?
Asked by modhukuruvenkateshwarlu | 13 Apr, 2024, 15:03: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Physics
what is anomalius expansion
Asked by thesangeeta1990 | 08 Mar, 2024, 16:37: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Are You a Teacher or a Parent Seeking Customised Tests? Click here
×