Question

An object moving at a speed of 5 m/s is required to be brought to rest in 2 s. Find the (i) work to be done in the process and (ii) power required.​

Answer 1

Given that

The initial speed of car=u= 5 m/s

Acceleration =a=0.2m/s2

Time=t=10s

We need to calculate the distance

We know that

v = u + at

= 5 + 0.2×10

= 5+2

= 7 m/s

s = ut + 1/2at²

= (5×10) + (1/2)×(2/10)×(10×10)

= 50 + 10

= 60 m

Final speed = 7 m/s

Distance traveled in 10 seconds = 60 m

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Answer 2

Answer:

An object moving at a speed of 5 m/s is required to be brought to rest in 2 s. Find the (i) work to be done in the process and (ii) power required