Answer:
1.36m/s
Explanation:
We are given that
Mass of one acrobat,
Mass of another acrobat,


We have to find their velocity immediately after they grab onto each other.
The collision between two acrobat is inelastic
According to law of conservation of momentum

Substitute the values



Explanation:
Track and Field is a sport, which is includes disciplines of running, jumping, and throwing events. The sport traces back to Ancient Greece. The first recorded examples of this sport were at the Ancient Greek Olympics. In Ancient Greece, only one event was contested, the stadion footrace. Later on, the game expanded to more events.Events of track and field are divided into three: track events, field events, and combined events. Track events consist of Sprints, middle-distance, long distance, hurdles and relays; Field events consist of jumps and throws; while combined events consist of pentathlon, heptathlon, and decathlon. Track and field is usually played outdoors in stadiums. The usual features of a track and field stadium are the outer running track, and the field within the track
Answer:
B 1500N
Explanation:
The acceleration of the car - at least the average one, but that will do, is 
We know the acceleration, we know the force, let's drop them in Newton second law.

Answer:
Net force, F = 7 N
Explanation:
It is given that,
Initial kinetic energy of the car, 
Final kinetic energy of the car, 
Distance, d = 1 m
We need to find the average net force on the car during this interval. It is given by using the work energy theorem as :


Also, W = F.d d = distance and F = net force



F = 7 Newton
So, the average net force on the car during this interval is 7 newton. Hence, this is the required solution.