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CBSE Class 9 Answered

A car initially at rest picks up a velocity of 72 km/hr in 20 seconds.If the mass of the car is 1000 kg, calculate : (i) the force developed by its engine (ii) distance covered by the car in 20 seconds ?
Asked by Vikas | 10 Jul, 2017, 12:24: AM
answered-by-expert Expert Answer
The following steps are to be followed for solving this query:
 
Step 1) In order to find force, we need mass and acceleration. Mass is given, and so the first step is to find acceleration. From the data given, we have u = 0 and v = 72 km/h = 20 m/s. Also, t = 20 s. So, use a = (v - u)/t to find a.
 
Step 2) Find force by using the formula F = ma
 
Step 3) Distance covered is to be found from the formula v2 = u2 + 2as
 
With these steps, you will be able to gauge the problem and the basic steps you need to follow to solve such problems. Hope it was helpful.
Answered by Romal Bhansali | 10 Jul, 2017, 11:06: AM

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