PLEASE HELP!! In coming to a stop, a car leaves skid marks 65 m long on...

Question

Question

In coming to a stop, a car leaves skid marks 65 m PLEASE HELP!!

science physics

Answer 1

Answer #1

distance covered from skid mark, S = 65m

deceleration (means negative acceleration) , a = - 4 m/s²

V_f (final speed) of car = 0 m/s

V_i ( initial speed of car before braking) = ?

from equation of motion:

V_f² - V_i² = 2*a*S

0 - V_i² = 2*( -4)* 65

V_i = 22.80 m/s

Answer 2

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