Question

A boulder of mass 4kg rolls over a cliff and reaches the beach below with a velocity of 20 ms-1 a) What is the kinetic energy of the boulder just before it lands

Answer 1

Answer:

800J

Explanation:

K.E = 0.5[ Mass× (Velocity)² ]

=> K.E = 0.5[ 4× (20²)]

=> K.E = 0.5[4× 400]

=> K.E = 0.5×1600

=> K.E = 800 J