Question

A particle travels 100 metres after starting from rest in 10 seconds. Its acceleration is d) force 2 m/s b) 4 m/s c) I m/s In uniform circular motion volocin d) 20 m • נח -​

Answer 1

Solution:

Equation of motion, s=ut+1/2at2

When s=24 m, t=4s,

we get 24=4u+1/2a(4)2

⇒ 24=4u+8a

⇒ 6=u+2a ——(1)

When body travels a total distance of 24+64=88 min 8 s,

we get 88=8u+1/2a(8)2

⇒ 88=8u+32a

⇒ 11=u+4a —–(2)

Solving Eqs. 1 and 2, we get u=1m/s

Answer 2

Answer:

They run from one end of the playground to the other end of the playground. They measure the time to complete the run. They repeat the run with umbrellas (a) Class 7 write down their results. no umbrella = 10 seconds with umbrella = 14 seconds no umbrella = 8 seconds with umbrella = 9 seconds no umbrella = 7 seconds with umbrella = 13 seconds no umbrella = 11 seconds with umbrella = 15 seconds Calculate the mean (average) times.