Question

How much work must be done to stop a 1000-kg car traveling at 100km/h?

Answer 1

Work done = ΔKE

W = 1/2mv²

⇒ W = 1/2 (1000) * (100 * 5/18)² = 385802 N

Answer 2

Dear Student,

◆ Answer -

W = 385864 J

● Explanation -

# Given -

m = 1000 kg

v = 100 km/h = 100/3.6 m/s = 27.78 m/s

# Solution -

Work must be done to balance kinetic energy of the moving car.

W = KE

W = 1/2 × m × v^2

W = 1/2 × 1000 × 27.78^2

W = 385864 J

Hence, 385864 J work must be done to stop a traveling car.

Thanks dear. Hope this helps you...