Question

Please help question4

Answer 1

Explanation:

Q3.

Vo = 54 km/h

Vf = 90 km/h

t = 10 s

i) a = ? m/s²

a = (Vf - Vo)/t

a = [(90 km/h × 1000 m/1 km × 1 h/3600 s)

- (54 km/h × 1000 m/1 km × 1 h/3600 s)] /10 s

a = (25 m/s - 15 m/s) /10 s

a = 10 m/s / 10 s

a = 1 m/s²

ii) d = ?

d = (Vf² - Vo²)/2a

d = ((25 m/s)² - (15 m/s)²)/2(1 m/s²)

d = ((625 m²/s² - 225 m²/s²))/2 m/s²

d = (400 m²/s²)/2 m/s²

d = 200 m

Answer 2

Answer:

Explanation:

Distance from A to B =2$\pi$r /2 =$\pi$r

r is unknown to us .

but we are given the circumference  i.e., 3140

3140= 2 × 22÷7 × r

3140*7/2*22=r

⇒r = 499.5   .

$\pi$r = 22/7*3140*7/22*2

⇒1570m =distance .

displacement =diameter =2r

⇒ 2*499.5

⇒999 m

the scooterist is moving with a uniform velocity

∴ sp. =d/t

⇒10=1570/t

t=157sec or 2min 37 sec