Answer:
Average speed will be 48.23 km/h
Explanation:
Let the distance up to hill is = d km
Speed when car goes to hill = 38 km/h
So time required
Speed when car return from hill = 66 km/h
So time required to return fro hill
Total time
Total distance = d+d =2d
So average speed
Answer:
The required force is 55.38 N.
Explanation:
First we have to find the spring constant K;
k = =
= 553.846 N/m
As,
F= -K
or, F= - 553.846 × 0.10
or, F= -55.3846 N
Hence,
= -
∴ = 55.38 N
The required force to stretch it by this amount is 55.38 N.