when brakes are applied to a car it retarded uniformly at 5 M / S 2 and stopped after 15 seconds find the initial velocity of the car
Answers
Answered by
70
retardation = - 5 m/s²
time = 15 sec
use kinematics formula,
V = U + at
where V is final velocity , U is initial velocity , a is acceleration and t is time .
here V = 0
U =?
a = -5 m/s²
t = 15 sec
then,
0 = U -5× 15
U = 75 m/s²
time = 15 sec
use kinematics formula,
V = U + at
where V is final velocity , U is initial velocity , a is acceleration and t is time .
here V = 0
U =?
a = -5 m/s²
t = 15 sec
then,
0 = U -5× 15
U = 75 m/s²
Answered by
46
Hi there !!
Here
acceleration, a = -5 m/s²
time , t = 15 sec
Initial velocity = u
Final velocity , v = 0
v = u +at
0 = u + - 5 × 15
0 = u + (-75)
Hence .
u = 75 m/s
Here
acceleration, a = -5 m/s²
time , t = 15 sec
Initial velocity = u
Final velocity , v = 0
v = u +at
0 = u + - 5 × 15
0 = u + (-75)
Hence .
u = 75 m/s
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