Question

A toy car of mass 4 kg moves up a ramp under the influence of force F plotted against displacement x. The maximum height attained is given by (Take g = 10 m/s²) 

(A) ymax = 5m 

(B) ymax = 8m 

(C) ymax = 15m 

(D) ymax = 20m

Answer 1

Correct option: (B) ymax = 8m

Explanation:

Workdone = F ∙ x = area under curve of F – x

Workdone = (1/2) × 8 × 80 = 320

As Workdone = mgh

320 = 4 × 10 × h

h = 8m