Question

A body of mass 2 kg is dropped from a height of 1 m.
Its kinetic energy as it reaches the ground is
(a) 19.6J
(b) 19.6 N
(c) 19.6 kg
(d) 19.6 m
Two bodies of unequal masses are dropped from a
cliff. At any instant, they have equal
(a) momentum
(b) acceleration
(c) potential energy
(d) kinetic energy​

Answer 1

Explanation:

Initially KE is zero.

by conservation of energy,

mgh = 1/2 mv^2

2×9.8×1 =KE

KE = 19.6 J

Both the bodies are undergoing free fall ie only gravity acts on them. So acceleration is equal. Masses are not equal hence momentum, KE and PE are unequal

Answer 2

Answer:

(c) 19.6 kg

Explanation:

This is correct answer