Question

A bicycle has a kinetic energy of 124 J. What kinetic energy would the bicycle have if it had

a) twice the mass and was moving at the same speed?
b) the same mass and was moving with twice the speed?
c) one-half the mass and was moving with twice the speed?
d) the same mass and was moving with one-half the speed?
e) three times the mass and was moving with one-half the speed?

Answer 1

Below

Step-by-step explanation:

KE = 1/2 mv^2

soooo ...

a) doubling m doubles KE
b) doubling 'v' makes KE 4 times greater (because v is v^2)

c) 1/2 *2^2 = double KE

d ) 1/2^2 = 1/4 KE

e) 3 * 1/2^2 = 3/4 KE