Question

A car weighing 900 kg moving with a velocity of 20 metre per second is uniformly accelerated with an acceleration of 2m per second for 10 seconds calculate work done and force required to accelerate the car.

Answer 1

force = 1800 N and workdone = 5.4 × 10^5 J

mass of car, m = 900 kg

initial velocity of car, u = 20 m/s

acceleration of car , a = 2m/s²

we have to find force required to acceleration this car and workdone after time t = 10s.

force = mass × acceleration.

so, force required to acceleration the car , F = 900kg × 2m/s² = 1800 N

workdone = force displacement.

so, we have to find displacement.

using formula, s = ut + 1/2 at²

= 20 × 10 + 1/2 × 2 × (10)²

= 200 + 100

= 300m

so, workdone = 1800 N × 300 m

= 540000 J

= 5.4 × 10^5 J

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Answer 2

$\huge\bold\purple{Answer:-}$

mass of car, m = 900 kg

initial velocity of car, u = 20 m/s

acceleration of car , a = 2m/s²

we have to find force required to acceleration this car and workdone after time t = 10s.

force = mass × acceleration.

so, force required to acceleration the car , F = 900kg × 2m/s² = 1800 N

workdone = force displacement.

so, we have to find displacement.

using formula, s = ut + 1/2 at²

= 20 × 10 + 1/2 × 2 × (10)²

= 200 + 100

= 300m

so, workdone = 1800 N × 300 m

= 540000 J

= 5.4 × 10^5 J