Question

1.An object starts from rest and has a displacement s=4t2 .It has a uniform acceleration of 8m/s2 .The velocity of the body at t=2s is
a. 4m/s
b. 16m/s
c. 12m/s
d. 18m/s

2.Shyam is enjoying a ride on a merry-go- around which is moving with a constant speed of 20m/s, it implies that Shyam is
a. At rest
b. uniformly accelerated
c. In zero acceleration
d. Moving with a speed of 10m/s

3.Identify in which of the following cases distances moved and magnitude of displacement are equal?
a. The planets are revolving round the Sun
b. A person riding in a merry go around c. A train moving along a straight railway track
d. The to and fro motion of a simple pendulum​

Answer 1

$\color{red} \underline{ \huge{Answer}} \\ 1):s = 4 {t}^{2} \\ \color{blue} \underline{differentiate \: w.r.t \: ‘t’} \\ v = \frac{ds}{dt} = 8t \\ \color{blue} \underline{at \: t = 2s}: \\ v = 8 \times 2 \\ \boxed{ v = 16 \: m {s}^{ - 1}} \\ \rightarrow(b) \: is \: correct \\ \\ 2): \rightarrow(a) \: is \: correct \\ \\ 3) : \rightarrow(c) \: is \: correct \\ \\ \red{\mathfrak{ \large{\underline{{Hope \: It \: Helps \: You}}}}} \\ \blue{\mathfrak{ \large{\underline{{Mark \: Me \: Brainliest}}}}}$

Answer 2

Answer:

please mark as brainlest i have followed u