# 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 | 10th Jul, 2017, 12:24: AM

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 v^{2} = u^{2} + 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.

^{2}= u

^{2}+ 2as

### Answered by Romal Bhansali | 10th Jul, 2017, 11:06: AM

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