A car of 50 kg attains the speed of 10 $m s^{- 1}$ in 5 seconds from rest. Calculate the force applied by the engine of the car? (in N)

100 N

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50N

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60 N

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20 N

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Solution

The correct option is A
100 N

Initial velocity $u$ = 0, final velocity $v$ = 10 $m s^{- 1}$ , time $t$ = 5 second, Mass $m$ = 50 kg.

We know that acceleration $a = \frac{v - u}{t}$

So, $a = \frac{10 - 0}{5} = 2 m s^{- 2}$

We know that, Force (F) = $m \times a$

Therefore, F = $50 \times 2$

On solving, F = 100 N

Thus required force = 100 N

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A car of 50 kg attains the speed of 10 ms−1in 5 seconds from rest. Calculate the force applied by the engine of the car? (in N)

The correct option is A 100 N Initial velocity u = 0, final velocity v = 10ms−1, time t = 5 second, Mass m = 50 kg. We know that acceleration a=v−ut So, a=10−05=2 ms−2 We know that, Force (F) = m×a Therefore, F = 50×2 On solving, F = 100 N Thus required force = 100 N

A car of 50 kg attains the speed of 10 $m s^{- 1}$ in 5 seconds from rest. Calculate the force applied by the engine of the car? (in N)