Question

plz slove these questions...............​

Answer 1

☆Answer 1

Given:

Speed1= 54km/hr =15 m/s , t1 = 20 sec, Distance = 15×20= 300 m

Speed2 = 36km/hr= 10 m/s ,t2 = 30 sec, Distance = 10 × 30= 300 m

Speed3= 18 km/hr= 5 m/s , t3 = 10 sec,

Distance = 50 m

$\bold\red{\mathbb{average\;speed =\frac{total\;distance}{total\;time\;taken}}}$

Solution:

Total distance = 300+300+50=650

Total time = 20+30+10=60

$\bold\red{\mathbb{average\;speed=\frac{650}{60}}}$

$\boxed{\boxed{\boxed{\mathbb{average\;speed=10.83m/s}}}}$

___________________

☆Answer 2

Acceleration is defined as rate of change of velocity with time.

SI unit of acceleration is m/s^2

Acceleration of a body is negative when the object is slowing down .

Examples-

● when any object is thrown up ,its velocity gets decreasing. Then acceleration goes in negative.

● Car braking

_____________________