Question

please answear question no. 9 and 10

Answer 1

9)
initial speed = u = 50m/s

final speed = v = 0m/s

time = t = 0.40 s

acceleration = a = ?

distance = d = ?


a)
a = v-u/t

a = 0-50/0.40

a = -50/0.40

a = -125m/s²

b)

v²-u² = 2as

(0)²-(50)² = 2(-125)(s)

0-2500 = -250s

-2500/250 = s

10 m = s
_____________________________
10)
initial speed = u = 54km/hr = 54000m/3600s = 15m/s

final speed = v = 72km/hr = 72000m/3600s = 20m/s

time = t = 10 s

acceleration = a = ?

a = v-u/t

a = 20-15/10

a = 5/10

a = 0.5m/s²