Question

A girl weighing 400 N takes 4s to run up the
stairs. How much P.E. does she gain, If height
of the stairs is 3 m?
(a) 1200
(b) 200 J
(c) 400 J
(d) 1200 J​

Answer 1

Answer:

(d) 1200 J

Explanation:

P. E = mgh

P. E = 400 × 3 J

P. E = 1200 J