A scooter is moving with a velocity of 20 m/s .The mass of the scooter and the rider is 180 kg the constant force applied is 500 N a)how long should the brakes be applied to make the scooter come to a halt b) how far does it travel before coming to rest
Answers
a) u (initial velocity) = 20 m/s
v (final velocity) = 0 m/s (as the vehical comes to rest)
m (mass) = 180 kg
force = -500 N ( as it comes to rest)
f = m(v-u)/t
so,
-500=180(0-20)/t
-500t=-360
t=360/500
t=0.72 s
b)s = ?
2as = v2-u2 (3rd equation of motion)
2x (v-u)/t x s= 0- 20x 20
2 x -27.7 x s = -400
s=400/55.4
s=7.22 m
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A scooter is moving with a velocity of 20 m/s .The mass of the scooter and the rider is 180 kg the constant force applied is 500 N a)how long should the brakes be applied to make the scooter come to a halt b) how far does it travel before coming to rest
Report by BrainyWarrior 28.07.2018
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Sahooabhi135 · Helping Hand
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NikiSwar06
NikiSwar06 Physics Newton
first we will have to find the time.
a) u (initial velocity) = 20 m/s
v (final velocity) = 0 m/s (as the vehical comes to rest)
m (mass) = 180 kg
force = -500 N ( as it comes to rest)
f = m(v-u)/t
so,
-500=180(0-20)/t
-500t=-360
t=360/500
t=0.72 s
b)s = ?
2as = v2-u2 (3rd equation of motion)
2x (v-u)/t x s= 0- 20x 20
2 x -27.7 x s = -400
s=400/55.4
s=7.22 m